Question: Corporate advertising tries to enhance the image of corporation. A study compared two ads from two sources, the Volkskrant and the Telegraaf . Subjects were asked to pretend that their company was considering a major investment in Prestomax, the fictitious 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 Prestomax?"on a 7-point scale. Higher values indicate more trustworthiness. Here is a summary of the results:

1. 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.
2. Give a 95% confidence interval for the difference.
3. Write a short paragraph summarizing the results of your analysis.

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