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Table gives the level of gross fixed capital formation Y , sales X1, both in thousands of dollars, and a productivity index X2, for 35 firms in an industry. It is expected that Y will be directly related to both X1 and X2. Regress Y on X1 and X2 for (a) the entire sample, (b) the 14 observations with the smallest values of X2 and record ESS1, and (c) the 14 observations with the largest values of X2 and record ESS2. (d) Test for the presence of heteroscedasticity.
Table Gross Fixed Capital Formation, Sales, and Productivity in 35 Firms
Firm
1
2
3
4
5
6
7
8
9
10
11
12
Y
30.9
31.5
43.2
36.9
44.3
30.5
32.3
42.9
31.2
39.1
35.7
40.8
X1
135
150
300
225
310
105
170
285
145
250
205
275
X2
10.3
10.8
16.4
12.9
16.7
10.0
10.9
15.9
10.6
14.6
12.1
15.5
13
14
15
16
17
18
19
20
21
22
23
24
42.1
32.8
36.3
37.4
33.4
44.9
45.2
30.2
140
280
180
215
235
110
190
230
315
195
320
100
10.5
15.6
12.5
13.8
11.1
13.1
17.1
11.3
17.3
9.9
25
26
27
28
29
30
31
32
33
34
35
45.9
46.8
35.1
40.2
47.9
30.7
38.1
49.3
31.9
37.8
330
345
200
260
350
120
355
165
245
17.5
17.9
11.5
14.9
18.3
10.1
14.1
18.5
13.9
10.7
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