The Wall Street Journal reported that Americans spend nearly $7 billion on Halloween costumes and decorations. Sample data showing the amount, in dollars, that 16 adults spent on a Halloween costume are as follows.

a. What is the estimate of the population mean amount adults spend on a Halloween costume?
b. What is the sample standard deviation?
c. Provide a 95% confidence interval estimate of the population standard deviation for the amount adults spend on a Halloween costume?

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