A survey of several 8 to 10 year olds recorded the following amounts spent on a trip to the mall: $11.83, $24.11, $19.93, $15.34 Construct the 99 % confidence interval for the average amount spent by 8 to 10 year olds on a trip to the mall. Assume the population is approximately normal. Copy Data Step 2 of 4: Calculate the sample standard deviation for the given sample data. Round your answer to two decimal places.

A survey was conducted that asked 1009 people how many books they had read in the past year. Results indicated that x = 14.4 books and s= 16.6 books. Construct a 90% confidence interval for the mean number of books people read. Interpret the interval. Click the icon to view the table of critical t-values. C Construct a 90% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to two decimal places as needed.) OA. If repeated samples are taken, 90% of them will have a sample mean between and H OB. There is a 90% probability that the true mean number of books read is between and OC. There is 90% confidence that the population mean number of books read is between and

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Please explain. In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $41 and standard deviation of $4. Find the margin of error at a 90% confidence level.Give your answer to two decimal places.