Measures of Variation (range and interquartile range)
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- เผยแพร่เมื่อ 27 ม.ค. 2015
- ✅CHECK YOUR ANSWERS✅
ON YOUR OWN ANSWERS
1) Range = 41 years old. The ages of people in line for a roller coaster vary by NO MORE than 41 years.
2a) Interquartile range (IQR) = 38 pages. The middle half of the data varies by NO MORE than 38 pages.
2b) 468 pages is an outlier because when you check using the IQR, 468 is greater than 455. (398 + 1.5(38) = 455)
This video introduces measures of variation, including the range and interquartile range. We discuss how to calculate both of those measures and what they tell us about the variation of the data. The helps us understand if there are any outliers and also how spread out or close together our data is.
the sound of the marker, it kills me from inside.
but the video was great,
Same
@Noah Ricketts nope, I like it too, also @Noah Ricketts, i'm in your class, so I can understand why you would like the sound.
What I liked most is the fact that you gave real problems for us to do, so that we can work things out on our own, but what about answers to make sure we did it right? I think my students will appreciate this video and benefit from it greatly. Thank you
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Omg, you are a life saver! A person doesn't realize how important the visual demonstration of algebra/statistics is until you take an online course that rely's solely on textbooks. You saved my butt BIG time.
YOU ARE A GODSEND!! You helped a very frustrated student who was ready to just give up!! Thanks!!
Your common sense approach and presentation made the mystery go away. Thank you for this video.
But how do i get quatiles when the data is so many?? i need the law in exams right??
5:07 a shorter from for 1st quartile is Q1
What were the answers to the 2 DIY problems?
thank you so much this video is really helpful
+kayshanna rolle That's great to hear!
Maybe a dumb question but where does the 1.5 come from? Is this a standard number or did you calculate it from the data given?
this really helped with my homework
i realize it is kind of randomly asking but does anybody know of a good website to watch new movies online ?
@Luka Arian lately I have been using Flixzone. You can find it by googling :)
Thanks for the help. Could you also post the answers to the questions you provide for solving? It would be better if we could cross-check our answers. Cheers :)
Good idea. I'll work on putting them in the description.
A great instructor and a great video.
Man no word can describe how I feel now after your explanation for this lesson. THANK YOU A MILLION TIME
Thank you so much for this video. You helped a lot me for my report. Great job 👌
Might be really late, but thanks to you I'm passing online school
Yas queen
This was great help!!
This was quite helpful and profound 🤝
My teacher told us to watch the video and take notes on this video for home work and I thought it would be boring but instead it really helped a lot so thank you for making this video. And I wold like to also thank my math teacher for making us take notes on this. I was really confused at first but now I get it. Plz leave a comment and like if the video helped you. Especially my class mate if they are watching this.
you helped me in my final exam for quarter 4
You saved the day! I was having trouble helping my daughter with her homework and this helped so much. Thank you!
No problem Aley! Glad it helped :)
I can't find an explanation to why we use the term quartile then only use Qi and Q3...you spoke of Q2 being the median but what happened to Q4 ? Maybe I'm taking the term quartile too literally???
+Marie-Catherine Pasierb I suppose Q4 would include the entire data set.
when you cut a line (of data) at 3 places (Q1,Q2,Q3) you get 4 line segments(data groups) each is 25% and called a quartile
Very nice Sir, very helpful examples you coded
Thanks this video was helpful for me at first I saw this name quartile or interquartile I was afraid of that but after watching this I felt confident sir. Thanks alot.
11 minutes of my life... *used*
Can I ask a question Is it truth that if the range is high the numbers are close together?
Great thanks for the update
Thanks this helped with my homework ☺
Oh my gosh thank you so much.
No worries! Glad it helped :)
did anyone else watch this on a fast speed?
me 😂😂😂
Lol i did
@Gavin Hays don't know
Me
Thank you, this really helped me on my math homework.
Ya this 11 minute video taught me what my math teacher probably could of done in two days of 1hr classes
using computer audio be like
chloe?
Where did u get the 1.5 from ?? For the outliers!
Its just a rule that goes with finding outliers. I was confused about it until my teacher told me why
I apologize in advance if this questions had already been asked, but.... when would it ever be useful to find the IQR? Is there an example of how this information would be useful in data presentation?
That's a great question. IQR will tell you whether or not the middle 50% of your data is really close together or spread out. For example, if you sold shoes and found that after collecting data on the shoe sizes sold your IQR was 2 (e.g. half of the data could be from size 6 to 8), that would mean that most of the shoes you sold are similar sizes. If the IQR was 6 (e.g. half of the data could be from size 4 to 10) then you know that you're selling a large variety of sizes.
Anywhere Math That makes perfect sense. Thank you!
Sorry
but your Forehead is HUGE!!!!
Thank you.
# I understand !!!
This video just saved me as a parent. Thx so much!
Thank you so much
):
Thanks for the video! Your explanation is wonderful.
yo
Where can I check my answers?
Here's the Answer
A: median :382
Q1=360
Q2=398
IQR=38
B: the lower quartile has no outlier
While the upper quartile has outlier
Here's the Formula for B
Q1-1.5(IQR)
360-1.5*38
360-57= 303
And the lowest number in the lower half is 350 so theirs no outlier
Second upper half
Q3+1.5*38=
398+57=455
the highest number in the upper half is 468 so there's outlier
thanks very helpful
Thank you so much i forgot how to do it and i left my notes in class this was a life saver😰😰😥😥
Thanks for wonderful video
Great video, thanks
Thank you so much. I couldn’t understand any tutorial even my teachers one and I was like “oh anywhere math how can I forget the best explanations” I got a 18/20 in the exam thanks so much!
hello
Thank you so much 😊 this video was veryyyyyyyyy helpful ❤
You're so welcome!
Great video, it really helped me a lot :)
Bro I still don’t understand 😢
This video helped so much thank yo u
I wish you could be my math tutur
@Odell Carr So do you.
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This video helped me a lot! Thanks 😘❤️
+Kylize Happy to help :)
Thanks this help my homework 👌🏻😊
thank u very much
Well done dear
thank you so much.
thanks for letting me do my homework
How did you get 30 from the 4th example?
+Rene Navarro 1.5 times 20 equals 30. When you write it like 1.5(20) the parentheses mean multiplication
thank you Jeff sir I have my exam tomorrow this really helped me
Love from India 🇮🇳
Suiiiiiiiiiiiiiii I agree loved this video
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You're quite welcome! I hope the exam went well :)
Your handwriting is 👌
So is there an outlier on the upper half of question 2) it goes lower than 363.5?
You're such an amazing man! It helps me a lot...I hope you'll be my teacher.😂
Great dude!! Boy I needed you in Undergrad and for the GRE Subject Exam!!
What would you have to do to find a mean?
Check out my video on Measures of Center. It includes the mean. th-cam.com/video/0jKKnwXsqr0/w-d-xo.html
***** thanks!
Ur cool thx for the help bro also I'm using ur videos for homework
Thanks. I hope the videos help :)
Yea it does work thx
where is the 4th quartile? theres only 3 in example 2. (sorry, i need this for my biostat)
Chez Doge the formula is Q3-Q1 ➗ by 2
Nice marker
I would recommend this to and math teacher and/or math tutor. So if a math teacher and/or tutor is watching this plz comment
Thank you
It will help with my exams
0:04
why did you chose 1.5???
helped so much. i wuv you
hey? whats your answer for the outliers?
Outlier 1.5(23)
Q1-1.5(IQR)= 322.5
Q3+1.5(IQR)=432.5
Is this correct?
It would be more helpful if when you give the viewers an problem to solve if you came back with the answer so they know if they got it correct or not.
The answers to the "On Your Own" questions are in the description below.
Hi
Very awesome
the sound quality is making me fear for my ear health
computer audio be like
Why Jeffery Jacobsen doesn't wear glasses in this Video
help me solve my hw
thank you
thanks
And I subscribed
busy with research psychology at the moment, and our so called advanced textbooks cannot compete with this level of simplicity... THANK YOU SO VERY MUCH
haha thanks! That makes me a little worried about your textbooks though :)
Why do you use big ideas math word problems?
Wow ur a amazing man. I love you (no homo)
+Gameel II Thanks!
so the 6 and 7 number will always be the meadian? what if there is only one in the middle and not two
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いいえ慈悲ん what's up
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Thomas Bruffey oh i'm sorry
what?
Omg this saved my life!!!
excellent helper! thank you do much!!
Here's the Answer
A: median :382
Q1=360
Q2=398
IQR=38
B: the lower quartile has no outlier
While the upper quartile has outlier
Here's the Formula for B
Q1-1.5(IQR)
360-1.5*38
360-57= 303
And the lowest number in the lower half is 350 so theirs no outlier
Second upper half
Q3+1.5*38=
398+57=455
the highest number in the upper half is 468 so there's outlier
9:22
I don't get this part... ;^;
Well, first you find the IQR, then you subtract 1.5(IQR) from the first quartile. If there is a number less than what you got from the equation, thats an outlier. do the same for the 3 quartile,adding not subtracting, but if there is a number greater than what you get from the equation, that will be an outlier. Hope this helps!
Thanks! It helped a lot! ^^
Np!
u seem to always be covering up the board but the lesson was good
This is the easiest way to do my math.
what if its odd number you only did even
fantastic
+ramsey said Thanks :)
Thank you for this video I was having trouble with measures of variation so I saw this video and now I understand it and because of this video I got a good score on my homework ( hopefully ).
The 199 comments bugged me so here is the 200th
thanks helps me very well.
dam 9 months ago we had onlin school almost been a year also to know what imm talking about look at the comment below me
Tysm man u the goat
Do not I repeat do NOT wear headphones while watching you e as ra will die from the squeak noise nice video though
that marker squek
Watvhing this for school