Reenen wants to start a cosmetic business, so she does some research on business start=up costs.

Reenen wants to start a cosmetic business, so she does some research on business start=up costs. Here is a random sample of start up cost (in thousands of dollars) from similar businesses that she has interviewed:  95 173 129 95 75 94 116 100 85. The mean of this sample is x bat and the standard deviation is s=29.4 thousand dollars. To be prepared with enough money, Reenen wants to find a 90% confidence interval for the population average start-up cost µ for cosmetics businesses.