In a survey, 21 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $8. Construct a confidence...

Extracted text: In a survey, 21 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $32 and standard deviation of $8. Construct a confidence interval at a 99% confidence level. Give your answers to one decimal place.