Practice quiz6 and soln

Practice quiz6 and soln - Practice questions for Quiz 6 to...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Practice questions for Quiz 6 to be given on October 27 ______1. Suppose that X has mean =5 and =10 and Y= 6- 4X. The standard deviation of Y equals_____ _____2. Suppose that X 1 , X 2 and X 3 have mean =5 and 2 = 4 and Cov(X j , X k ) =0 for j k . Then the variance of Y= X 1 X 2 + 2X 3 equals_______ 3-4. Suppose we take a random sample of n=4 values of X. We let X 1 denote the first value in the sample, X 2 denote the second value, X 3 denote the 3 rd value and X 4 denote the 4 th value. Given (1) 1 = 2 = 3 = 4 = x = 2 and (2) 1 = 2 = 3 = 4 = 2 x =9. Let 4 4 1 = = i i X X . _______ 3. Regardless of the value of N, the mean value of X equals____ ________ 4. If N>> 4 then Cov(X j , X k ) = 0 for all j k and the X j are independent, so Var( X ) = ____ 1 SOLUTIONS TO QUIZ 4A ___ 40 ___ 1. Suppose that X has mean =5 and =10 and Y= 6- 4X. The standard deviation of Y equals_____ Y= 6-4X. If Y=aX + b then 2 Y = a 2...
View Full Document

Page1 / 2

Practice quiz6 and soln - Practice questions for Quiz 6 to...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online