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b) [5 pts]Find a 95% confidence interval estimate for the difference between the average recall rate for the two ad versions. Question 3 (10 pts) According to the University of Nevada Center for Logistics Management, 6% of all merchandise sold in it store sampled 80 items sold in January and Develop appropriate hypotheses for a test to determine the United States gets returned. A Houston department store sa whether the proportion of returns at the Houston store significantly different from the returns for the found that 12 of the items were returned. Devel nation as a whole? Draw the conclusion at 0.05 level of significance. Using P-value approach to answer this question. Ho: HA: Test statistic: Decision rule (P-value approach): Make the decision and draw the conclusion