Author Question: Given a sample correlation r = -0.5 and a sample size of n = 30, the test statistic for testing ... (Read 141 times)

luminitza · **on:** Jun 24, 2018

Given a sample correlation r = -0.5 and a sample size of n = 30, the test statistic for testing whether the two variables are significantly correlated is approximately t = -3.055.

Indicate whether the statement is true or false

Question 2

A cell phone company wants to determine if the use of text messaging is independent of age. The follow data has been collected from a random sample of their customers.

Regularly use text messaging Do not regularly use text messaging
Under 21 82 38
21-39 57 34
40 and over 6 83

Using the data above, in order to test for the independence of age and the use of text messaging, the expected value for the under 21 and regularly use text messaging cell is 82.
Indicate whether the statement is true or false