According to the University of Nevada Center for Logistics Management, 8% of all merchandise sold in the United States gets retumed. A. Houston department store sampled 70 items sold in January and found that 12 of the items were returned. a. Construct a point estimate of the proportion of items returned for the population of sales transactions at the Houston store. (to 4 decimals) b. Construct a 90% confidence interval for the proportion of returns at the Houston store. ) (to 4 decimals) c. Is the proportion of returns at the Houston store significantly different from the returns for the nation as a whole? Provide statistical support for your answer. Since the confidence interval 0.08, we conclude that the return rate for the Houston store the U.S, national return rate.