The accompanying data file contains the annual stock return (in %), the price-to-earnings ratio (PE), and the price-to-sales ratio (PS) for 30 firms.

a. Estimate the model: Return = β₀ + β₁PE + β₂PS + ε. Specify the sample regression equation.

b. At the 10% significant level, are PE and PS jointly significant? Show the relevant steps of the test.

c. Are both explanatory variables individually significant at the 10% significance level? Show the relevant steps of the test.

Return	PE	PS
4.4	14.37	2.41
-4.5	11.01	0.78
5.9	11.97	2.24
4.8	11.28	1.35
-11.4	9.81	1.82
20.6	15.65	0.8
64.3	16.06	1.61
18.5	8.98	1.01
-15.5	11.36	2.76
48.1	13.73	1.43
7.2	11.46	1.2
20.9	14.32	1.29
-18.3	8.17	0.81
3.1	9.5	2.67
12.1	11.17	1.97
-4	12.64	2.75
1.8	9.68	1.99
15.9	13.45	1.14
22.9	14.96	3.34
-1.4	8.93	2.38
-8.4	10.53	3.7
-3.7	7.91	2.2
15.4	16.38	4.58
21.2	16.29	0.87
6.1	15.05	2.31
11.7	9.17	0.99
13.4	14.93	1.38
15.6	15.59	0.91
0.9	12.58	0.47
16.3	13.94	1.94