Question

Suppose the following data were collected from a sample of 5 car manufacturers relating monthly car sales to the number of dealerships and the quarter of the year. Use statistical software to find the following regression equation:

SALESi=b0+b1DEALERSHIPSi+b2QUARTER1i+b3QUARTER2i+b4QUARTER3i+ei

Is there enough evidence to support the claim that on average, car sales are higher in the 4^th quarter than in the 3^rd quarter at the 0.05 level of significance? If yes, write the regression equation in the spaces provided, rounded to two decimal places. Else, select "There is not enough evidence."

Car Sales

Monthly Sales	Number of Dealerships	1st Quarter (1 if Jan.-Mar., 0 otherwise)	2nd Quarter (1 if Apr.-Jun., 0 otherwise)	3rd Quarter (1 if Jul.-Sep., 0 otherwise)	4th Quarter (1 if Oct.-Dec., 0 otherwise)
85401	4	1	0	0	0
101310	8	1	0	0	0
121366	12	1	0	0	0
133695	16	1	0	0	0
194582	20	1	0	0	0
82196	4	0	1	0	0
150452	8	0	1	0	0
242729	12	0	1	0	0
260330	16	0	1	0	0
273428	20	0	1	0	0
65448	4	0	0	1	0
101488	8	0	0	1	0
150143	12	0	0	1	0
165448	16	0	0	1	0
200437	20	0	0	1	0
98501	4	0	0	0	1
200387	8	0	0	0	1
250187	12	0	0	0	1
306530	16	0	0	0	1
389519	20	0	0	0	1

Selecting a checkbox will replace the entered answer value(s) with the checkbox value. If the checkbox is not selected, the entered answer is used.

Answer 1