Measures of Variation (range and interquartile range)
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- Опубликовано: 21 авг 2024
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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.
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hello
5:07 a shorter from for 1st quartile is Q1
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using computer audio be like
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But how do i get quatiles when the data is so many?? i need the law in exams right??
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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.
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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.
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No worries! Glad it helped :)
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Bro I still don’t understand 😢
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Nice marker
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
the sound quality is making me fear for my ear health
computer audio be like
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?
Thanks for wonderful video
Thank you so much
):
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Great video, it really helped me a lot :)
Well done dear
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
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This video helped me a lot! Thanks 😘❤️
+Kylize Happy to help :)
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
It will help with my exams
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Can I ask a question Is it truth that if the range is high the numbers are close together?
thanks
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help me solve my hw
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
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
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?
And I subscribed
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
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 ).
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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
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!
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
fantastic
+ramsey said Thanks :)
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The 199 comments bugged me so here is the 200th
What would you have to do to find a mean?
Check out my video on Measures of Center. It includes the mean. ruclips.net/video/0jKKnwXsqr0/видео.html
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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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what if its odd number you only did even
why did you chose 1.5???
So is there an outlier on the upper half of question 2) it goes lower than 363.5?
Why do you use big ideas math word problems?
0:04
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