Statistics Solutions

[Solution] IRS answers to gift tax questions. According to estimates made by the General Accounting Office, the Internal Revenue Service (IRS) answered 18.3

Question: IRS answers to gift tax questions. According to estimates made by the General Accounting Office, the Internal Revenue Service (IRS) answered 18.3 million telephone inquiries during a recent tax season, and 17% of the IRS offices provided answers that were wrong. These estimates were based on data collected from sample calls] numerous IRS offices. How many IRS offices should} randomly selected and contacted in order to estimate t} proportion of IRS offices that fail to correctly answer questions about gift taxes with a 90% confidence interval of width .06?

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