Americans spend nearly $7 billion on Halloween costumes and decorations. Sample data showing the amount, in dollars, 16 adults spent on a Halloween costume are contained in the Excel Online file below. Construct a spreadsheet to answer the following questions.

a. What is the point estimate of the population mean amount adults spend on a Halloween costume (to 2 decimals)?

$

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)?

$ $

Dollars Spent

11

68

20

65

35

38

30

42

55

14

13

95

47

35

63

23