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2. (10 marks) A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per

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2. (10 marks) A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to a theme park spend per person per day. She knows that the standard deviation of the amounts spent per person per day by all visitors to this park is $11. How large a sample should the researcher select so that the estimate will be within $2 of the population mean

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