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l) Find a 99% confidence interval for the partial slope of the population regression line pertaining to the independent variable camera body. Provide an explanation of the meaning of this interval in the context of the problem. Show how this interval can be used to answer the question posed (at the 1% level of significance) in part j) of the problem.

m) Find a 99% confidence interval for the partial slope of the population regression line pertaining to the independent variable price of lens. Provide an explanation of the meaning of this interval in the context of the problem. Show how this interval can be used to answer the question posed (at the 1% level of significance) in part k) of the problem.

n) Find the variance inflationary factor for this model. Use it to draw a conclusion as to whether there is the existence of a significant amount of collinearlity in this model. Justify your answer.

Sales of Body	Price of Lens	Gender	Sales of Lens
155	$700	1	122
101	650	1	120
157	725	0	135
180	575	1	95
150	600	0	100
201	750	0	174
99	560	1	118
137	500	0	130
155	675	1	128
165	550	1	166
152	725	0	131
127	750	1	102
217	565	0	165
186	670	0	154
176	600	1	97
123	585	0	129
109	645	0	98
90	575	1	105
176	660	0	120
129	650	1	105

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