Confidence interval estimate for the above calculated mean

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1. During an audit of XYZ company,the auditor wishes to estimate the mean outstanding account balance from a sample of 80 accounts.Assume that the balance is normally distributed.The 80 accounts have a mean of $86.05 and a standard deviation of $22.38. Estimate the mean.

2. Calculate a 90% confidence interval estimate for the above calculated mean.

Reference no: EM131509035

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