The first time, I got the answers wrong. Please help, thank you!

According to the University of Nevada Center for Logistics Management, 6% of all merchandise sold in the United States gets returned. A Houston department store sampled 80 items sold in January and found that 7 of the items were returned. (a) Construct a point estimate of the proportion of items returned for the population ofsales transactions at the Houston store. If required, round your answer to three decimal places. (b) Construct a 95% confidence interval for the porportion of returns at the Houston store. If required, round your answer to three decimal places. to (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. We fail to reject the null hypothesis. We cannot conclude that the return rate for the Houston store is different than the U.S. national return rate