Homework Help: math

Posted by mayra on Saturday, November 19, 2011 at 3:49pm.

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.

math - Steve, Saturday, November 19, 2011 at 3:56pm
cool. what's the question?
math - mayra, Saturday, November 19, 2011 at 3:58pm
how do you Construct a 90% confidence interval for the population average time to complete the tax forms.

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