If two variables are highly correlated, it not only means that they are linearly related, it also means that a change in one variable will cause a change in the other variable.
Indicate whether the statement is true or false
Q. 2The Gilbert Company chief financial officer has been tracking annual sales for each of the company's three divisions for the past 10 years.
At a recent meeting, he pointed to the annual data and indicated that it clearly showed the seasonality associated with its business. Given the data, this statement may have been very appropriate. Indicate whether the statement is true or false
Q. 3Given 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
Q. 4A 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
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