The covariance of two variables X and Y: a. must be between -1 and +1. b. must be positive. c. ...

Author Question: The covariance of two variables X and Y: a. must be between -1 and +1. b. must be positive. c. ... (Read 153 times)

drink

Hero Member
Posts: 554

on: Jun 24, 2018

The covariance of two variables X and Y:
a. must be between -1 and +1.
b. must be positive.
c. can be any real number.
d. None of these choices.

Question 2

If X and Y are random variables with E(X) = 6 and E(Y) = 9, then E(2X + 3Y) is:
a. 39
b. 15
c. 27
d. 12

ladyjames123

Sr. Member
Posts: 346

Reply #1 on: Jun 24, 2018

Answer to Question 1

C

Answer to Question 2

A

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drink

Hero Member
Posts: 554

Reply #2 on: Jun 24, 2018

Correct answers!

ladyjames123

Sr. Member
Posts: 346

Reply #3 on: Jun 24, 2018

Great! Please up vote

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