Use the following information to answer the questions: Suppose that an accounting firm does a study to determine the time needed to complete one person's tax forms. It randomly surveys 145 people. The sample mean and standard deviation respectively are 20.3 and 7.8 hours. There is a known standard deviation of 7.8 hours. The population distribution is assumed to be normal. Find the 89% confidence interval. Round all answers to the nearest hundredth. (a) = (b) s = (c) σ= (d) n = Enter DNE if this is unknown. Enter DNE if this is unknown. (e) Critical Value ? (f) Find the 89% confidence interval and complete the sentence below. Conclusion: We estimate with needed is between and % confidence that the population mean time hours.

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