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Inference in the Yellow Pages Effect

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To determine the effect of advertising in the Yellow Pages, Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales(in thousands of dollars) for each store in both years were recorded and stored in file yellow pages
a. Estimate with 90% confidence the improvement in sales between the two years.
b. Can we infer that advertising in the Yellow pages improves sales?
c. Check to ensure that the required condition(s) of the techniques used in parts a. and b. is satisfied
d. Would it be advantageous to perform this experiment with independent samples? Explain why or why not.

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The expert determines the effect of advertising in the Yellow Pages.

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To determine the effect of advertising in the Yellow Pages, Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales(in thousands of dollars) for each store in both years were recorded and stored in file yellow pages
a. Estimate with 90% confidence the improvement in sales between the two years.
We construct the following table:
This Year Last ...

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