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 for predicting starting salary (Y) using number of hours spent studying per day (X) for a sample of 51 students. NOTE: Only partial output is shown.

Note: 2.051E - 05 = 2.051*10⁻⁰⁵ and 5.944E - 18 = 5.944*10⁻¹⁸.
-Referring to Table 13-9, the degrees of freedom for the F test on 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 for predicting starting salary (Y) using number of hours spent studying per day (X) for a sample of 51 students. NOTE: Only partial output is shown.
  
Note: 2.051E - 05 = 2.051*10⁻⁰⁵ and 5.944E - 18 = 5.944*10⁻¹⁸.
-Referring to Table 13-9, the degrees of freedom for the F test on 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 the F test in a simple linear regression are (1, n-2), where n is the number of observations. If there are 51 observations, then the degrees of freedom would be (1, 49).

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