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\f3. Vacation Days Travel Data: A U.S. Travel Data Center survey reported that Americans stayed an average of 7.5 nights when they went on vacation. The sample size is 1500. a) Give the point estimate of the population mean. b) Compute the 95% confidence interval of the true population mean if the population standard deviation was 0.8 night. Round to 2 decimal places. Write the answer in the form: lower boundary