It is believed that, the average numbers of hours spent studying per day (HOURS)
ID: 3380867 • Letter: I
Question
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.
Regression Statistics
Multiple R
0.8857
R Square
0.7845
Adjusted R Square
0.7801
Standard Error
1.3704
Observations
51
ANOVA
df
SS
MS
F
Significance F
Regression
1
335.0472
335.0473
178.3859
Residual
1.8782
Total
50
427.0798
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
-1.8940
0.4018
-4.7134
2.051E-05
-2.7015
-1.0865
Hours
0.9795
0.0733
13.3561
5.944E-18
0.8321
1.1269
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]. Explain your reasoning.
Regression Statistics
Multiple R
0.8857
R Square
0.7845
Adjusted R Square
0.7801
Standard Error
1.3704
Observations
51
ANOVA
df
SS
MS
F
Significance F
Regression
1
335.0472
335.0473
178.3859
Residual
1.8782
Total
50
427.0798
Coefficients
Standard Error
t Stat
P-value
Lower 95%
Upper 95%
Intercept
-1.8940
0.4018
-4.7134
2.051E-05
-2.7015
-1.0865
Hours
0.9795
0.0733
13.3561
5.944E-18
0.8321
1.1269
Explanation / Answer
It is believed that, the average numbers of hours spent studying per day (HOURS)
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.