Homework3 - University of California, Davis ARE 106 -...

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University of California, Davis ARE 106 - Winter 2011 Homework 3 There will be no quiz based on these homework problems, however this material will be covered on the midterm exam held Thursday, January 27, 2011 Conceptual Questions 1. What are null and alternative hypotheses? Explain the difference between them. 2. What is an interval estimate? 3. What is a test statistic? 4. When could we use a Z-test and when could we use a t-test to assess the significance of our estimated regression coefficient, b 2 ? 5. What is a Type I error? 6. What is a Type II error? 7. How could we be 100% sure never to make a Type I error? Why might this not be a good idea? Computational Questions 1. You are the marketing manager for mid-sized paper supply company. You gather data on monthly advertising expenditure and sales in order to assess the effectiveness of the company’s ad spending. You want to consider the effect of ad spending on sales and conduct (Note that all figures are in thousands of dollars.) Advertising Spending 3 3 6 8 5 6 5 4 4 Sales 40 34 55 49 48 50 38 42 50 (a) Write out the population regression function . (b) Obtain estimates for the slope and intercept of the regression equation using the
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This note was uploaded on 01/13/2012 for the course ARE 32482 taught by Professor Havenner during the Spring '10 term at UC Davis.

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Homework3 - University of California, Davis ARE 106 -...

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