Solutions to Ma381, Exam 2 (blue version), F04

Solutions to Ma381, Exam 2 (blue version), F04 - (16 pts...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
(16 pts.) Multiple Choice. For each problem, circle the single best response. 1. If X and Yare random variables and a,b,c are constants, then E(aX + bY + c) = a E(X) + b E(Y) + c (~:;!~~r~' , b. Sometimes c. Never 2. If X and Yare independent random variables and a,b,c are constants, then Var(aX + bY + c) = a2 Var(X) + b2 Var(Y) (;N~ ~ 'i~~~~mes c. Never 3. The value of <1>(5.0) is ~ ~~~.ver nearlyO . Very near y c. Cannot e accurately determined 4. If X and Yare independent random variables with common standard deviation 0', then the standard deviation of ~ X-! Y is 4 4 a. ~O' Vav- ct z ~-{~) Q]j;) -:. . (1 ) 2 V~-g:.) + (-t)-z.\1,t-~) C.O' f Q '2- '-a. . ..s- '2. . ::.J-CJ"~ -0- ::"_",",, CoO' I. r ~ v~:-(~~-=-i-;)- -=- JT ~ 2
Background image of page 1

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

View Full DocumentRight Arrow Icon
5. (18 pts.) The (total) ankle diameter of a sample of 507 adults is displayed in the histogram below. As you can see, it is reasonable to assume that ankle diameter is normally distributed. Suppose that a good-fitting normal curve to this data is one with a mean, ,Lt, of 13.90 cm, and a standard deviation, 0", of 1.25 cm.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This homework help was uploaded on 01/21/2008 for the course MATH 381 taught by Professor Johnson during the Fall '04 term at SDSMT.

Page1 / 5

Solutions to Ma381, Exam 2 (blue version), F04 - (16 pts...

This preview shows document pages 1 - 3. Sign up to view the full document.

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