SCENARIO 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: 2.051 E - 05 = 2.051*1 0-5 and 5.944 E -18 = 5.944 *10 -18 .
-Referring to Scenario 13-9,the 90% confidence interval for the average change in SALARY (in thousands of dollars)as a result of spending an extra hour per day studying is
A)wider than [-2.70159,-1.08654].
B)narrower than [-2.70159,-1.08654].
C)wider than [0.8321927,1.12697].
D)narrower than [0.8321927,1.12697].

Question

SCENARIO 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: 2.051 E - 05 = 2.051*1 0-5 and 5.944 E -18 = 5.944 *10 -18 .
-Referring to Scenario 13-9,the 90% confidence interval for the average change in SALARY (in thousands of dollars)as a result of spending an extra hour per day studying is
A)wider than [-2.70159,-1.08654]. 
B)narrower than [-2.70159,-1.08654]. 
C)wider than [0.8321927,1.12697]. 
D)narrower than [0.8321927,1.12697].

Quizplus · Accepted Answer

A 90% confidence interval is narrower than a 95% confidence interval, so it would be narrower than [0.8321927,1.12697].

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