ATI TEAS Crash Course® Book + Online by John Allen

Author:John Allen
Language: eng
Format: epub
Publisher: Research & Education Association
Published: 2017-04-21T04:00:00+00:00

M.2.3 PROBLEM 1

Which of the following pairs of variables has a negative covariance?

(A)x = number of snowfalls in one winter, y = number of snow shovels sold

(B)x = number of hours Reza works in a month, y = amount of Reza’s paycheck

(C)x = time spent running on a treadmill, y = number of calories burned

(D)x = number of customers renting a room in a motel, y = number of rooms available

STRATEGY

To solve this problem, remember that negative covariance means that as one variable increases, the other decreases.

THINK

•Answer choices (A), (B), and (C) all show positive covariance. As one variable increases, the other variable also increases.

•For (D), as more customers rent rooms in a motel, the number of rooms available decreases. This is a negative covariance, or negative correlation. Answer choice (D) is correct.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.