Find the standard deviation of the total assets held by the bank in the Excel file Credit

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Find the standard deviation of the total assets held by the bank in the Excel file Credit Risk Data.
a. Treating the records in the database as a population   and compute 90%, 95%, and 99% confidence intervals for the total assets held in the bank by loan applicants using formula (6.2) and any appropriate Excel functions. Explain the differences as the level of confidence increases.
b. How do your confidence intervals differ if you assume that the population standard deviation is not known but estimated using your sample data?

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