ent: Chapter 11 Assignment Assignment Score: 95.00% Save Submit Assignment for Grading Exercise 11.07 Algo (Inferences About a Population Variance) Question 4 of 10 Hint(s) Check My Work In 2017, Americans spent a record-high $9.1 billion on Halloween-related purchases (the balance website). Sample data showing the amount, in dollars, 16 adults spent on a Halloween costume are as follows. 13 69 26 64 32 38 31 46 52 14 14 97 47 35 66 28 a. What is the estimate of the population mean amount adults spend on a Halloween costume (to 2 decimals)? 42.00 b. What is the sample standard deviation (to 2 decimals)? $ 23.24 c. Provide a 95% confidence interval estimate of the population standard deviation for the amount adults spend on a Halloween costume (to 2 decimals). Use Table 11.1. $ 29.62 * Sos$ 54.38 Hide Feedback Partially Correct Hint(s) Check My Work On Icon Key