TABLE 13-9
It is believed that, the average numbers of hours spent studying per day (HOURS) during undergraduate education should have a positive linear relationship with the starting salary (SALARY, measured in thousands of dollars per month) after graduation. Given below is the Excel output from regressing starting salary on number of hours spent studying per day for a sample of 51 students.
Note: Some of the numbers in the output are purposely erased.

-Referring to Table 13-9, the degrees of freedom for testing whether HOURS affects SALARY are
A) 1, 49
B) 1, 50
C) 49, 1
D) 50, 1

Question

TABLE 13-9
It is believed that, the average numbers of hours spent studying per day (HOURS) during undergraduate education should have a positive linear relationship with the starting salary (SALARY, measured in thousands of dollars per month) after graduation. Given below is the Excel output from regressing starting salary on number of hours spent studying per day for a sample of 51 students.
Note: Some of the numbers in the output are purposely erased.
 
-Referring to Table 13-9, the degrees of freedom for testing whether HOURS affects SALARY are
A) 1, 49 
B) 1, 50 
C) 49, 1 
D) 50, 1

Quizplus · Accepted Answer

The degrees of freedom for testing the effect of a single independent variable (HOURS) on a dependent variable (SALARY) in a simple linear regression is (1, n-2), where n is the sample size. Assuming the sample size is 51, the degrees of freedom would be (1, 49).

TABLE 13-9 It Is Believed That, the Average Numbers of Hours Spent