You intend to estimate a population mean with the following sample. 42.4 33.4 44.3 36.6 34.9 48.4 50.9 35.7 You believe the population is normally distributed. Find the 98% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 98% C.I. = 33.15 Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. In a survey, 31 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $30 and standard deviation of $5. Find the margin of error at a 98% confidence level. Give your answer to two decimal places. 2.09 Submit Question