Save Submit Assignment for Grading ions 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)? O O b. What is the sample standard deviation (to 2 decimals)? $ 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. $ Sos$ Hint(s) Check My Work O- Icon Key Question 4 of 10 Exercise 11.07 Algo (Inferences About a Population Variance) Save Submit Assignment for Grading