Marketing managers. Are wages for various marketing managerial positions related? One way to determine this is to examine the relationship between the mean hourly wages for two managerial occupations in marketing: sales managers and advertising managers. The average hourly wage for both occupations is reported for all U.S. states and territories by the U.S. Bureau of Labor Statistics

(data.bls.gov/oes; Occupational Employment Statistics;

accessed May 2008). Here are the regression analysis results.

a) State the null and alternative hypothesis under investigation.

b) Assuming that the assumptions for regression inference are reasonable, test the null hypothesis.

c) State your conclusion.

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Predictor Coeff SE(Coeff) t-ratio P-value Constant 10.317 4.382 2.35 0.0227 Sales Mgr Avg Hourly Wage 0.56349 0.09786 5.76 <0.0001