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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. a. What is the 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). Use Table 11.1 $$

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  • 1. 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. a. What is the 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). Use Table 11.1 $$