Question

Repair Time in Months Since Last Hours 2.9 3.0 Service 2 6 8 3 2 7 Type of Repair Repairperson Electrical Mechanical Electrical Mechanical Electrical Electrical Mechanical Mechanical Electrical Electrical Donna Newton Donna Newton Bob Jones Donna Newton Donna Newton Bob Jones Bob Jones Bob Jones Bob Jones Donna Newton 1.8 2.9 4.9 4.2 8 4 6

Answer 1

d)

SUMMARY OUTPUT
Regression Statistics
Multiple R	0.8249
R Square	0.6805
Adjusted R Square	0.5892
Standard Error	0.6915
Observations	10
ANOVA
	df	SS	MS	F	Significance F
Regression	2	7.1291	3.5646	7.4553	0.0184
Residual	7	3.3469	0.4781
Total	9	10.476
	Coefficients	Standard Error	t Stat	P-value	Lower 95%	Upper 95%
Intercept	3.5263	0.9381	3.7591	0.0071	1.3081	5.7445
X Variable 1	0.1519	0.1230	1.2349	0.2567	-0.1390	0.4428
X Variable 2	-1.0835	0.6051	-1.7907	0.1165	-2.5144	0.3473

e) When Electrical=1 and Mechanical=0

SUMMARY OUTPUT
Regression Statistics
Multiple R	0.9120
R Square	0.8317
Adjusted R Square	0.7475
Standard Error	0.5421
Observations	10
ANOVA
	df	SS	MS	F	Significance F
Regression	3	8.7127	2.9042	9.8820	0.0097
Residual	6	1.7633	0.2939
Total	9	10.476
	Coefficients	Standard Error	t Stat	P-value	Lower 95%	Upper 95%
Intercept	2.6035	0.8360	3.1142	0.0207	0.5578	4.6492
X Variable 1	0.2039	0.0990	2.0598	0.0851	-0.0383	0.4462
X Variable 2	0.9135	0.3936	2.3213	0.0593	-0.0495	1.8765
X Variable 3	-1.0893	0.4744	-2.2961	0.0614	-2.2502	0.0715