A store randomly samples 603 shoppers over the course of a year and finds that 142 of them made their visit because of a coupon they'd received in the mail. Construct a 95% confidence interval for the fraction of all shoppers during the year whose visit was because of a coupon they'd received in the mail. (please round all proportions to four decimal places)Estimate the true proportion of shoppers during the year whose visit was because of a coupon they'd received in the mail.