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you want to compare the daily sales for two different designs of web pages for your internet business. You assign the next 90 days to either designs A or B, 4 days each. (a) Would you use a one-sided or two-sided significance test for this problem? Explain your choice. (b)If you use Table D to find the critical value, what are the degrees of freedom using the second approximation? (c) If you perform the significance test using a=0.05, how long (positive or negative) must the t statistic be to reject the null hypothesis that the two designs results in the same average daily sales?

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