e source in the sportswear company ad for performax?" On a 7-point scale. Higher values indicated more trustworthiness. Here is a summ
Corporate advertising tries to enhance the image of the corporation. A study compared two ads from two sources, the wall street journal and the national enquirer. Subjects were asked to pretend that their company was considering a major investment in performax, the fictious sportswear firm in the ads. Each subject was asked to respond to the question " How trustworthy was the source in the sportswear company ad for performax?" On a 7-point scale. Higher values indicated more trustworthiness. Here is a summary of the results.
AD SOURCE. N Standard deviation Sample mean
wall street journal. 66 1.50 4.77
National Enquirer 61 1.64 2.43
a) Compare the two sources of ads using a T test. Be sure to state your null and alternative hypotheses, the test statistic with degrees of freedom, the P value and your conclusion.
b) Give a 95% confidence interval for the difference
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