Question 147978
12.48 In the following regression, X = weekly pay, Y = income tax withheld, and n = 35 McDonald’s employees. 
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Note: Only your reference to the book and the problem number make it
possible for anyone to help you with this problem.
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(a) Write the fitted regression equation.
Y = 30.7963 + 0.0343X
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(b) State the degrees of freedom for a twotailed test for zero slope, and use Appendix D to find the critical value at α = .05.
df = 33 ; critical value is 2.035 (see page 782) 
(c) What is your conclusion about the slope? 
Since the p-value is 0.0068 (less than 1%), the true value is not zero.
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(d) Interpret the 95 percent confidence limits for the slope.
We are 95% confident that the slope is between 0.0101 and 0.0584
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(e) Verify that F = t2 for the slope. 
2.889^2 = = 8.346321 (rounded is 8.35)
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Cheers,
Stan H.