The accompanying data on x advertising share and y market

Chapter 0, Problem 13.11

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The accompanying data on x advertising share and y market share for a particular brand of cigarettes during 10 randomly selected years are from the article Testing Alternative Econometric Models on the Existence of Advertising Threshold Effect (Journal of Marketing Research [1984]: 298308). x .103 .072 .071 .077 .086 .047 .060 .050 .070 .052 y .135 .125 .120 .086 .079 .076 .065 .059 .051 .039 a. Construct a scatterplot for these data. Do you think the simple linear regression model would be appropriate for describing the relationship between x and y? b. Calculate the equation of the estimated regression line and use it to obtain the predicted market share when the advertising share is .09. c. Compute r 2 . How would you interpret this value? d. Calculate a point estimate of s. On how many degrees of freedom is your estimate based?

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