If the mean is not equal to 2, it is a 2-third test, and if the mean is less than 2, it's a 1-third test. Can you please explain this better in the next video?
I just want to say that your videos go over the exact curriculum in classes I’ve take since high school and I almost have my degree now, I have probably watched your videos more that my lectures. I don’t know how you have this much skill and organization to put the videos out that you do, but ur a straight blessing to any student out there who needs help - u the best tutor ever
If your reading this comment, thank you! You saved me from a big quiz in school and i didnt study for it but this video while riding the bus to school is a blessing. Got 55/60. THANK YOU!
you literally saved me from mental breakdowns for the nth time now. I have been watching your videos since i was in junior high and now i'm in college your vids are so comprehensive than what my teachers and the books taught me. It is hard to cope esp in this pandemic when i have no one else to ask for help but your vids are rlly helpful so thank you sm
I've been watching him since sophomore year of high school and now I'm a junior in college and am graduating. It's wild how much this man has saved my grades since I was 16 lol
To those wondering on the Z-score values of 1.96 and confidence value of 95%: Confidence level (CL) formula = 1 - (confidence value) = 1 - 0.95 = 0.05, and we divide this by 2 (0.05/2) to get the alpha values on both tails ~ 0.025. You can also use this formula A = (1-CL)/2 which gives you your alpha for one tail. As these graphs are symmetric we put the alpha values on both sides. Once you have this value you go on your Z-score table. At alpha value = 0.025, look down at the (deg of freedom which is given by formula: 1 - n, where n is sample size) but since we have 1 - 40 = 39... The 39 is no where on the freedom column. In this case we use the infinity value which is: 1.960 ~ 1.96 Cheers
"The 39 is no where on the freedom column. In this case we use the infinity value which is: 1.960 ~ 1.96" Is this because it is a Z distribution? if its T should I just use the nearest degrees of freedom to the value of n-1?
@@los1868 same concept. If you do not find the deg of freedom that matches on your table then you can use the infinity value from the t distribution. (I am not a teacher sorry so I can't describe the story as to why but this is something I find works in every question that I have encountered so far.) Hope it helps!
Thank you for taking your time and going through The Z and t procedures in a step-by-step manner in which I could understand understand. Furthermore I appreciate the way you compared the t critical value To the T test statistic using the formula which now helps me to understand how you reject or fail to reject the null hypothesis.
I feel so safe watching these videos like I am going to actual get information that is clear, concise & makes sense. I wish my professors understood that is far more important, then trying to impress me with jargon.
Mehn.... this guy you are literally an academic saver......there is nothing that I don't get to understand after watching your videos. Thanks a million!!!!!
Another great video. Thanks a ton. My stats Professor is decent at explaining fundamentals but this really puts everything he’s said into context and practice. You seriously saved me hours and hours worrying.
I read my module for almost 1 hour and I have a difficulty understanding it but in the first 5 mins of this video I already understand the lesson that I am studying. THANK YOU SO MUCH!
What a perfection 😮 I have learned from you for 2 years and during these times i was absent in the class.because i know that no one is better than you Thanks alot for all lessons not only in statistics, but also all other subjects
Makes so much sense! This week in my MATH302 course we’re going over hypothesis testing for sample T-Test, sample Proportion, 2 Proportions, 2 independent samples, paired samples.
PSA: the professor you get for Stats matters so much. I was scared of taking Stats, and now I've fully learned and enjoyed the class because my Prof is great, he's very helpful, well spoken, and hands on when helping us understand. A good teacher makes all the difference!! and asking tutors for help :) good luck y'all, you got this!
Man....where were you went I was struggling with stats! I learned more in this video than I did during a whole term at school. Awesome work. Thank you.
Thank you Mister for dedicating so much time, I followed in Applied Calculus videos and I passed the course thanks to you! I hope do good as well in Applied Statistics! Thank you again!!!!!
You are literally saving me. My exam is in less than 13 hours. Ive been in a class for 4 months and have understood nothing. I now know what's going to be on my final. I am in so much debt to you. Thank you!!!
omg thank you so much. I was so confused about how the t-test and rejection/accepting the null hypothesis worked together. I've been so confused about all of this for like 3 years (yes I procrastinated that much). It should really help me pass my statistics test for biochem. working the way through example was a really good way of explaining it.
I'm currently preparing for the CFA exam. You clearly and easily explained this material in under 14 minutes whereas my study guide devotes a 20- page chapter. THANK YOU!!
This video is a destiny saver. I lost in class , it's just opaque so I decided to watch and learn from you. I'm glad I did and thank you for putting up such a great content.
According to voice you seemed to be younger than me. Im using your lectures a lot. May your god bless you for what you are doing to help others. Please publish more videos.
Your videos on youtube are simply the best it has help me to validate all my Biochemistry courses. Thank you JG. I wish I could make videos like you just that I don't have the equipments 😁
Same, I think we should. It would help our fellow STEM colleagues so they won't get stuck on this and can instead use their minds to advance the fields and postulate new ideas. Any help would be useful
thank you so much for this video. my teacher talks way too fast and talks in "numbers" (he doesnt work with the board to show us his calculations but instead does his calculations orally). what i had trouble doing for 2-3 weeks, i figured it all out with your help x)
Organic Chemistry Guy. You ARE my university statistics teacher. I'm 64 yo and haven't been in university for 41 years and I'm loving every lesson you put out.
Thank you!! This topic was giving me soo many problems and I couldn't understand it from my teacher for the life of me! But this cleared me right up, I even have an exam on this topic today and now I feel prepared rather that stressed, thanks!!
Did your prof teach you to determine it this way: If population SD is known, use Z-test If population SD is unknown, use T-test? If yes, I'm having the same confusion as you
lmaooo I have an exam today that I havent prepared for, but this man is making me feel like I will actually pass, best education account fr, way better than proper university lessons. Should be paying my fees to this guy.
As per the video, our condition for t test is sample size less than 30 and population std not known. However, population std was not known even in 1 scenario also. But what role does population std plays here. Coz' in both the examples, we didn't needed to use population std..so why this factor is important
1.96 is the critical Z value. Actually calculating it is complicated and you usually aren't expected to know how or memorise them. You usually can just look it up. It's like the relative molecular masses of elements.
Your videos on youtube are simply the best it has help me to validate all my Biochemistry courses. Thank you JG. I wish I could make videos like you just that I don't have the equipment thank you so much brother
The critical value is the normal distribution table value of the level of significants (1-the confidence interval) example--- (1-.99) = .01 look this value up in the normal distribution table.
Thank you for the simple explanation... our prof ate our brain while teaching this! Couldn't figure out what is the meaning of these values and procedure until this.
You take that 0.95, subtract it from 1, you get 0.05, divide it by 2, you get 0.025. Then you go to your z distribution table to look for 0.025, it's under 1.96
in the problem no. 2, it is a left tailed test therefore if it is 0.99 confidence, its alpha is 0.005 not 0.01, because 0.01 is for two tailed test only.
the explanation in the first problem was so clear that it only took me a couple of minutes to grasp the topic and solve the second problem myself, thanks a lot
Statistics - Video Lessons: www.video-tutor.net/statistic.html
i love you
Helloo! Can you please make a video lecture of hypothesis testing using t test and z test again, but this time with managerial decisions? Thank you!
@@micahazzeyah6133 very good in teaching
0
If the mean is not equal to 2, it is a 2-third test, and if the mean is less than 2, it's a 1-third test. Can you please explain this better in the next video?
No cap, I learn more from this youtube page than my actual university lessons
As always. University is just a proof that you probably learn it not a means to actually learn something 😂
University Assigns, TH-cam Teaches.
@@13GreatBeatBox wise words
Me too
same
this man is going straight to heaven.
Aamiin
I know what you mean, but my dude that sounds like a threat lmfaoooo
@AUN MAQSOOD :)
Amen
Amen
I just want to say that your videos go over the exact curriculum in classes I’ve take since high school and I almost have my degree now, I have probably watched your videos more that my lectures. I don’t know how you have this much skill and organization to put the videos out that you do, but ur a straight blessing to any student out there who needs help - u the best tutor ever
If your reading this comment, thank you! You saved me from a big quiz in school and i didnt study for it but this video while riding the bus to school is a blessing. Got 55/60. THANK YOU!
Youre welcome
nah watching this video is studying for it
Study next time, said the instructor..
man how you got a quiz outta 60?
this man is why I’m passing stats I swear
It's my turn 🤣
real
💯😂😂
😂
you literally saved me from mental breakdowns for the nth time now. I have been watching your videos since i was in junior high and now i'm in college your vids are so comprehensive than what my teachers and the books taught me. It is hard to cope esp in this pandemic when i have no one else to ask for help but your vids are rlly helpful so thank you sm
How did he get the 0.025??
Please enlighten mee
@@NONAME-yv3lq Its the leftover 5% from the 95% confidence level, split on each side to make 0.025 or 2.5%.
I've been watching him since sophomore year of high school and now I'm a junior in college and am graduating. It's wild how much this man has saved my grades since I was 16 lol
To those wondering on the Z-score values of 1.96 and confidence value of 95%:
Confidence level (CL) formula = 1 - (confidence value) = 1 - 0.95 = 0.05, and we divide this by 2 (0.05/2) to get the alpha values on both tails ~ 0.025.
You can also use this formula A = (1-CL)/2 which gives you your alpha for one tail. As these graphs are symmetric we put the alpha values on both sides.
Once you have this value you go on your Z-score table.
At alpha value = 0.025, look down at the (deg of freedom which is given by formula: 1 - n, where n is sample size) but since we have 1 - 40 = 39...
The 39 is no where on the freedom column. In this case we use the infinity value which is: 1.960 ~ 1.96
Cheers
This is my question, thank you so much
"The 39 is no where on the freedom column. In this case we use the infinity value which is: 1.960 ~ 1.96" Is this because it is a Z distribution? if its T should I just use the nearest degrees of freedom to the value of n-1?
@@los1868 same concept. If you do not find the deg of freedom that matches on your table then you can use the infinity value from the t distribution. (I am not a teacher sorry so I can't describe the story as to why but this is something I find works in every question that I have encountered so far.) Hope it helps!
Thank you man
do you mean the T table because in z score table there is no alpha or deg of freedom ?
thank you, this better than 2 hours of listening to my teacher,
You can say that again 😀
Yes it is
yep
yes i agree ahaha
Swearsss!!!!!!
This man is the reason i quit alcohol.
he is the reson i kicked my coke addiction
He is the reason I quit dealing meth
he is the reason I closed P**nhub and started watching YT
@@Skulltroxx OH HELL NAHH
this thread lmfaoooo
Couldn’t learn anything in class from my prof. Started watching these. My tests have been over 20% higher. God bless you.
bro 2 lectures and two tutorials, 8 hours and this guy made me understand better in 13 mins
my god, I'm not even expecting for you to cover this, searched it and boom.
God sent you.
Exams day tomorrow and this really help me understan A LOT. THANK YOU😩
Thank you for taking your time and going through The Z and t procedures in a step-by-step manner in which I could understand understand. Furthermore I appreciate the way you compared the t critical value To the T test statistic using the formula which now helps me to understand how you reject or fail to reject the null hypothesis.
The alternative hypothesis is not rejected when the null hypothesis is rejected?
I feel so safe watching these videos like I am going to actual get information that is clear, concise & makes sense. I wish my professors understood that is far more important, then trying to impress me with jargon.
Mehn.... this guy you are literally an academic saver......there is nothing that I don't get to understand after watching your videos. Thanks a million!!!!!
Another great video. Thanks a ton. My stats Professor is decent at explaining fundamentals but this really puts everything he’s said into context and practice.
You seriously saved me hours and hours worrying.
I read my module for almost 1 hour and I have a difficulty understanding it but in the first 5 mins of this video I already understand the lesson that I am studying. THANK YOU SO MUCH!
This guy’s lectures are very detailed while my professor’s lectures are too abstract. Thank you so much for helping me out!
What a perfection 😮
I have learned from you for 2 years and during these times i was absent in the class.because i know that no one is better than you
Thanks alot for all lessons not only in statistics, but also all other subjects
I was certain I was going to fail my statistics exam today until I found your videos. You are the best. Thank you.
Makes so much sense! This week in my MATH302 course we’re going over hypothesis testing for sample T-Test, sample Proportion, 2 Proportions, 2 independent samples, paired samples.
You literally explain in the best way for dummies, I swear! A lifesaver.
Better than your Marxist professors? Who would of thought.
PSA: the professor you get for Stats matters so much. I was scared of taking Stats, and now I've fully learned and enjoyed the class because my Prof is great, he's very helpful, well spoken, and hands on when helping us understand. A good teacher makes all the difference!! and asking tutors for help :) good luck y'all, you got this!
@abbieamavi can I show you a problem?
my professor sucks
POV you have an exam and your here to teach yourself the entire course
Frrrr the last 2 chapters got me rethinking my whole life
Fr 😂
😂😂😂😂 iriiiz what iriiiz
This is hella funny😂😂😂on the last day at that
I don't know how you do this, but you make everything sooooo much easier. Bless your soul man. Love you.
Dude you made me pass 3 years worth of uni. I watched you for 1 third of my courses. That's legit insane
Man....where were you went I was struggling with stats! I learned more in this video than I did during a whole term at school. Awesome work. Thank you.
I've watched videos that teach the t-test but this video explained the purpose and calculations more masterfully. Thank you.
Thank you Mister for dedicating so much time, I followed in Applied Calculus videos and I passed the course thanks to you! I hope do good as well in Applied Statistics! Thank you again!!!!!
You are literally saving me. My exam is in less than 13 hours. Ive been in a class for 4 months and have understood nothing. I now know what's going to be on my final. I am in so much debt to you. Thank you!!!
In fact I was so confused after my lecturer rushed me through this but now I have gained freedom from this lessons, God bless you so much Prof ❤️
Really helped me with my stats final
omg thank you so much. I was so confused about how the t-test and rejection/accepting the null hypothesis worked together. I've been so confused about all of this for like 3 years (yes I procrastinated that much). It should really help me pass my statistics test for biochem. working the way through example was a really good way of explaining it.
Literally the first person that has helped me make sense of the "reject/not reject". Great teacher!
I'm currently preparing for the CFA exam. You clearly and easily explained this material in under 14 minutes whereas my study guide devotes a 20- page chapter. THANK YOU!!
Agreed. Used for my CFA, by far a much clearer explanation
Ah, hello there, fellow CFA folks. This man does make hypothesis testing much easier!
This video is a destiny saver. I lost in class , it's just opaque so I decided to watch and learn from you. I'm glad I did and thank you for putting up such a great content.
According to voice you seemed to be younger than me. Im using your lectures a lot. May your god bless you for what you are doing to help others. Please publish more videos.
👋😀
I could find everything i look for. Just love this channel. Thank you.
Rare gem. Thanks a lot for all your explanations.
Best video in hypothesis. I spent days listening to hours and hours of videos on hypothesis but this is the best one
Your videos on youtube are simply the best it has help me to validate all my Biochemistry courses. Thank you JG. I wish I could make videos like you just that I don't have the equipments 😁
Same, I think we should. It would help our fellow STEM colleagues so they won't get stuck on this and can instead use their minds to advance the fields and postulate new ideas. Any help would be useful
Thank you !
I never understood the one and two tailed test before and watching this video will help me with my biostatistics class.!
Thank you, man. Exactly this question was given as the take home test and I get done within few minutes after watching.
thank u so much, after searching on youtube for hours finally someone who goes straight to the point
Amazing stuff... u r a life saver. I have actually grasped the dreaded Hyp. testing in full now. Awesome!!!
this channel literally saved my life more than i can count atm no cap
thank you so much for this video. my teacher talks way too fast and talks in "numbers" (he doesnt work with the board to show us his calculations but instead does his calculations orally). what i had trouble doing for 2-3 weeks, i figured it all out with your help x)
Your teacher sounds "fun".
Organic Chemistry Guy. You ARE my university statistics teacher. I'm 64 yo and haven't been in university for 41 years and I'm loving every lesson you put out.
Thank you!! This topic was giving me soo many problems and I couldn't understand it from my teacher for the life of me! But this cleared me right up, I even have an exam on this topic today and now I feel prepared rather that stressed, thanks!!
This instructor filter every dirt from dirty water and sprinkle it on our mind. I learnt a lot
This is so useful holy bless you!
This page is single-handedly helping me get my degree.
Thank you so much!! keep doing what you do. You are an excellent teacher.
Your channel always comes in clutch. I genuinely love you man.
My university professor discussed this for 3hours, yet nothing came into my mind lmao😂 this 13mn discussion makes me feel smart y'all
I learned more from you than csu professor. Everyone teaches differently thank you. Your lessons are blessing.
me literally watching this during my final exam
Me also after 2 yr of this comment
Just 2 hr before exam 😂😂
Me also watching during my final exam
😂😂
❤
it's you who should receive my tuition fee as opposed to my professor and the school at large. you do a wonderful job.
Help! Our professor taught us to determine whether to use z or t-test, we look at the SD!
Z-test = Population SD
T-Test = Sample SD
Did your prof teach you to determine it this way:
If population SD is known, use Z-test
If population SD is unknown, use T-test?
If yes, I'm having the same confusion as you
@@stephaniandrea5726 Mine did
@@stephaniandrea5726 if u unknow SD but ur sample is >30, u can use T-test ecuation to know Z value
This entire comment section...THANK YOU ❤️
@@killergames3634 why is it 30?
You get right to the point and show the problem with a very calming manner.!
I watch these to help me sleep. Lol
Thank you for this video..i really learn a lot..hope to see more videos from you..Godbless
Very helpful review for a college student who has taken stats in pasts semesters and wants to teach it. Thank you!
Why universities don't hire these TH-camrs.... 😅
😅😅😅
You are definitely the best teacher ever. Thanks a lot Sir.
Null hypothesis of life: life is painful because of those non departmental courses, which you can't reject
Oh my God! You just saved me, I have exam on Monday and because of this video I'm going to make it
well i guess, i should've just enrolled here in youtube instead of school since i still go to youtube to learn our lessons.
lmaooo I have an exam today that I havent prepared for, but this man is making me feel like I will actually pass, best education account fr, way better than proper university lessons. Should be paying my fees to this guy.
Did you pass?
As per the video, our condition for t test is sample size less than 30 and population std not known. However, population std was not known even in 1 scenario also.
But what role does population std plays here. Coz' in both the examples, we didn't needed to use population std..so why this factor is important
I don't know what i would be without your videos. Literally theeee best. Thank you sm.
for the first question, since the sd was from the sample of 40, shouldnt we find the unbiased estimate of the sample variance first ?
This video seriously SERIOUSLY helped, between yours & Maths & Science tutor’s channel, you guys are teaching me stats from the ground up! 💯
How did we get the 1.96?
th-cam.com/video/sJyZ9vRhP7o/w-d-xo.html
1.96 is the critical Z value. Actually calculating it is complicated and you usually aren't expected to know how or memorise them. You usually can just look it up. It's like the relative molecular masses of elements.
@@animanfan5442 where can I find it?
@@pamjarina8201 just search for Z/t values. It’s like searching the value of pi
Your videos on youtube are simply the best it has help me to validate all my Biochemistry courses. Thank you JG. I wish I could make videos like you just that I don't have the equipment thank you so much brother
You didn’t explain how to get the critical values
The critical value is the normal distribution table value of the level of significants (1-the confidence interval) example--- (1-.99) = .01 look this value up in the normal distribution table.
Thank you for the simple explanation... our prof ate our brain while teaching this! Couldn't figure out what is the meaning of these values and procedure until this.
why is the critical value 1.96 ?
Use z table
In a normal distribution curve 95% of the values lie between -1.96SD to 1.96SD. 99% of values lie between 2SD to 2 SD.
You take that 0.95, subtract it from 1, you get 0.05, divide it by 2, you get 0.025. Then you go to your z distribution table to look for 0.025, it's under 1.96
THis is the best math channel on TH-cam, saves me every exam!
Sponsor of your Finals preparation
OMG! You are saving my life in my QM520 class! Never stop doing what you do.
can somebody tell me where 1.96 came from in the first example pls
He got another video about finding the z-score in his channel
Search and you’ll find it.
I was wondering the same thing...did you ever figure it out?
We'll take our exam on Statistics a few hours from now and your video is a big help for me to answer my exam. Thank you!
I didn't understand can you help me
in the problem no. 2, it is a left tailed test therefore if it is 0.99 confidence, its alpha is 0.005 not 0.01, because 0.01 is for two tailed test only.
no it would be 0.005 for 2 tailed test because u have 0.01 split over 2 zones, right and left
@@SirGrizzlyman exactly
He's actually right but alpha is 0.01 but alpha/2 is 0.05 one tail should be used so 3.250 not 2.82
Thanks I was confused because I was using the Zc value for the critical region instead of the z table value..I'm clear now
Where did you get the 1.96
That's my wonder too
Normal Distribution Tables, You do Area Left = (1 + cl )/2 then you at what exactly that area corresponds to as a Z value.
Whenever i watch your videos i gain confidence for solving these problems.Thanks again man
I think you are the closest thing to god we have in this world
Real😂
You've single handedly have been carrying me through STEM for the past half decade
Honestly your teaching is far more better than my teacher. Keep up the good work sir.
the explanation in the first problem was so clear that it only took me a couple of minutes to grasp the topic and solve the second problem myself, thanks a lot
Thank you so much man. I'm having an exam in the next 5hrs
You really explained this well 😊
I'm literally crying rn. I needed this for my report, thank you so much! Keep posting videos plssss.
Oh man, I’m so happy and lucky to met this channel and have found all my concerns of stats and math ❤
THANK YOU SO MUCH. Seeing these brilliantly simple to understand examples is really helpful for me to conceptulize the topic
This makes me crystal clear on null and alternative hypothesis testing.... Thank you so much for this video
wow,i was to compalain about the values of 1.96,but then i have realised,patience was being tested on my side.Thanks sir for your wonderful approach
you are a savior, i prepare for all my exams with your videos
Short and straight to the point. You are always there to for us as science students Sir and thank you so much.