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QUESTION
You are conducting an audit at a home improvement firm.
1. You are conducting an audit at a home improvement firm. Suppose that, after consulting with company officials, you determine that a sampling error of no more than +/- $5 is desired, at a 95% confidence level. Past data indicate that the standard deviation of the sales amount is approximately $25. Determine the sample size needed.
You should select a sample of ________ insulators.
