Describe the difference in shape between a beta(shape1 = 2, shape2= 10) distribution and a beta(shape1 = 10, shape2= 2) distribution. I.e.,  are the  skew, mean, and interquartile ranges of the two distributions the same, and if one is larger, which one?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 22PFA
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Describe the difference in shape between a beta(shape1 = 2, shape2= 10) distribution and a beta(shape1 = 10, shape2= 2) distribution. I.e.,  are the  skew, mean, and interquartile ranges of the two distributions the same, and if one is larger, which one? (Note that shape 1 and shape 2 are also called alpha and beta respectively.)

Expert Solution
Step 1

Given:-

      β12,10   and   β210,2

we have to find the mean,skew and interquartile ranges of both distribution for describe the difference

Step 2

 

Formula:-

mean    EX=aa+b

 

skew=2b-aa+b+1a+b+2ab

 

interquartile range=(a-13)(a+b-23)

 

Step 3

now,

   β12,10

mean=22+10   =   16     =0.166

skew=2×10-2×2+10+12+10+2×2×10     =    0.921

median=2-132+10-23       =   0.146 

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