1. The Excel file New Account Processing provides data for a sample of employees

1. The Excel file New Account Processing provides data for a sample of employees in a company. Assume that the company has 125 people in total assigned to new account processing. Find a 95% confidence interval for the total sales of the population of account representatives. 2. It is known that the standard deviation of the lifetime of light bulbs manufactured by a company is 30 hours. How large should the sample size be so that we are 90% confident that the estimated mean lifetime of these light bulbs is no more than ± 3 hours away from the true lifetime?

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