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 average is 23.8 hours. There is a known population standard deviation of 6.0 hours. The population distribution is assumed to be normal.

Answer 1

cool. what's the question?

Answer 2

how do you Construct a 90% confidence interval for the population average time to complete the tax forms.