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This is Statistics. Provide solution if necessary thanks. 1. Suppose that an accounting firm does a study to determine the time needed to complete one

This is Statistics. Provide solution if necessary thanks.

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1. Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 100 people. The sample mean is 23.6 hours. There is a known standard deviation of 7.0 hours. The population distribution is assumed to be normal. Construct a 90% confidence interval for the population mean time to complete the tax forms

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