Mathematics, 03.12.2019 01:31, desdes1499

The monthly advertising expenditure of discount hardware store is normally distributed with a known standard deviation of $100. if a sample of 10 randomly selected months yields a mean advertising expenditure of $500 monthly, what is the lower bound for the 80% confidence interval for the mean of the store's monthly advertising expenditure?

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The monthly advertising expenditure of discount hardware store is normally distributed with a known...