Table gives the quantity of milk (in thousands of quarts) supplied by a firm per month Q at various prices P over a 14-month period. The firm faced a strike in some of its plants during the fifth, sixth, and seventh months. Run a regression of Q on P (a) testing only for a shift in the intercept during periods of strike and nonstrike and (b) testing for a shift in the intercept and slope.
Table Quantity Supplied of Milk (in Thousands of Quarts) at Various Prices
|
Month
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
|
Q
|
98
|
100
|
103
|
105
|
80
|
87
|
94
|
113
|
116
|
118
|
121
|
123
|
126
|
128
|
|
P
|
0.79
|
0.80
|
0.82
|
0.82
|
0.93
|
0.95
|
0.96
|
0.88
|
0.88
|
0.90
|
0.93
|
0.94
|
0.96
|
0.97
|