How To... Perform a One-Sample t Test (By Hand)
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- เผยแพร่เมื่อ 23 ส.ค. 2024
- When you want to compare a sample with a population, the one sample t test is what you need. In this exercise you will learn how to compare a sample of 20 measures of systolic blood pressure with a known population mean of 120.
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A talented teacher is one who assumes the student knows nothing and can explain in the clearest, most simple manner . You are very talented, sir, and you are a great assistance to many students.
Thank you so much for these clear and well explained videos. I am eternally grateful that you've taken the time to publish such a useful and easy to follow example.
You are a fabulous teacher, no question about it. A not so simple idea is so well explained, in a smart structured way, and in a short time. I am grateful.
thank you so much Eugene. I have a test tomorrow and I was literally freaking out. This helped me out lots. Please keep up the good work.❤
best t test explanation I've seen and I've been looking. crystal clear
Thank you, I'm a psych student doing a stats unit and my stats exercise tomorrow and had no idea how to tackle these stats needed!
PSY173?
@@uselessspectator9427 Yes!
@@sarahmichelle4421 I've got to appear for my final semester exam on 15th ..stats and stats nothing else
@@czarsharma2003 Best of luck! Stats sucks
@@sarahmichelle4421 yes!! Pretty much but what sucks more is that you have to physically appear for each and every exam coz you are in your last semester
you explained this better than my stats professor could in 45 minutes. thank you.
This was amazing. This video is what helped me pass my final. Thank you for being such a good professor and thank you for posting this video.
Simple and Clean. Appreciate your work, professor. You're a boon and a blessing for students.
Bless you sir!
I’ve got my Psych Stats final tomorrow. Trying to get the concepts thoroughly etched in my brain.
hi please add more of these by hand test you are the only one I can understand statistics with
OMG, you save my chance of passing this class!!!Thank you so much!!
You are a very good teacher. Your explanations are very clear and easy to undertand especially for some like who doesn't like mathematics and never heard of these statistics calculations, like ANOVA. it sounded like supernova at first 😀and t-test? Thank you so much.
Thank you very, I might not fail my stats now I actually know what to do
Thank you Eugene! I have my first stats test tomorrow and this is the most straight forward explanation I have seen so far! You Saved me.
P.S. I think you might have a future as a narrator if teaching stats gets old.
:-)
Thank you Eugene, you saved me from lots of trouble.
Have a test tomorrow. Thank you
Thank you for patiently working through each of these problems! Extremely helpful for students!
Very nice video.Explained very well.
Very well explained. Best I’ve seen so far. Thank you sir.
Nicely explained video. Thanks a lot!!
Love from India
Great thanks a lot
Thank you Prof. This is just what I needed!!
Super clear calculations. Great help, nice!!!
Really nicely explained
Great Visual example...gratitude.
Thank you for this video. Very helpful for my studies. 👍
you are doing a great job. thanks a million
Hi there, great videos ! Really informative
I just have a stupid question if anyone could answer.
I don't understand why mu would be used in the hypotheses given we already have the population mean of 120.
Why is the alternative hypothesis that the population mean is not equal to 120. isn't the difference we are looking in our sample mean ?shouldn't it be that the sample mean is not equal to 120 as we already know that the population mean is.
thank you so much. you save my life
Thank you so much, sir. This video helped me understand the basics.
The best
Thank you for these helpful videos, i wonder do you have vids for normality test? Im confused about Kolmogorov Smirnow, Shapiro Wilk and other normality tests, when in what condition each test is used? Thank you
Thank you Doc
Thank you
🙌🙌good explanation but make same changes on your tutorial......
thankyou sir
Thanks man
Thnk yu ver much,😘😘😘
Good day. Do you have a link on the Table that you're using?
you are good
For the hypotheses why is it population mean instead of sample mean?
Sir, for sample standard deviation we have to divide by (n-1) or n?
n-1 for samples, n for populations.
why do i keep getting the sample mean to be 130.25 instead of 130.05?
Hi Felix,
Please check your data again. I have just rechecked the calculation and 130.05 is the correct mean. It may be that my hand-writing is not that easy to read, so here are the data for you to work with:
128
118
144
133
132
111
149
139
136
126
127
115
142
140
131
132
122
119
129
128
Hope this helps,
Dr E.
if tcrit is higher than tstate, what does this reveal?
the null hypothesis is invalid
Hello, why did you use two-tails?
Hi Chiken Wings,
The question I am asking here is: "Does the blood pressure (BP) of female doctors differ from the regular population of women?"
I am not asking if the BP is higher or lower - this would involve a one-tail test. I just want to know if there is a difference - this means a two-tail test.
Of course, there are only two options when you find a difference: BP will be higher or lower. In the video, the result I got indicated that the BP is higher in female doctors - I can tell this from the positive value (4.513) for the t statistic, which falls in the right tail.
So - use a two-tail test when you want to find out if there is a difference.
Hope this helps,
Dr E.
@@EugeneOLoughlin It helped a lot Dr. Thank you so much for explaining
Please check your mean value, I calculated it to be 130.25 instead of your value of 130.05
Both numbers are not much of difference; therefore, they can both be considered correct.
calculates standard deviation before he says the value
value= 9.96
me: how the heck did I get 273?
DO you have 2 sample T Test?
Hello Ayy,
Yes - you can see two sample t Tests and other statistics videos on my "How To... Statistics by Hand" playlist:
th-cam.com/play/PLfGMkZaH76AmBzace1FjpQveu80dmC-80.html
Hope this helps,
Dr E.
Everyone!!! Please help me in psych stats, I don't know how to survive this sub. I watched series of vids here in yt but even the "simplest" explanation can't absorb by my brain. 911, hello?! Help me guys.
Thank you
Thnk yu ver much,😘😘😘