Exercise 13.16 described a regression analysis in which y 5 sales revenue and x 5 advertising expenditure.
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Exercise 13.16 described a regression analysis in which y 5 sales revenue and x 5 advertising expenditure. Summary quantities given there yield n 5 15 b 552.27 sb 5 8.05
a. Test the hypothesis H0: b 5 0 versus Ha: b 0 using a significance level of .05. What does your conclusion say about the nature of the relationship between x and y?
b. Consider the hypothesis H0: b 5 40 versus Ha: b .
40. The null hypothesis states that the average change in sales revenue associated with a 1-unit increase in advertising expenditure is (at most) $40,000. Carry out a test using significance level .01.
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Related Book For
Statistics The Exploration And Analysis Of Data
ISBN: 9781133171744
007th Edition
Authors: Roxy Peck, Ay L Devore
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