Crownfashions.com wants to estimate the average time that visitors to its website spend browsing the site. In a random sample of 49 visits this week, average browsing time is 13.6 minutes. Assume you know the population standard deviation is 5.2 minutes. Construct an 80% confidence interval estimate of average browsing time for the population of crownfashion. com visitors this week. Report the margin of error indicated by the interval. Question 18 0/2pts Uling the t table, determine the proper boundaries for a 95% interval (symmetric about the center) for a t distribution with df - 17. Report the upper bound