Solved: If the dean wanted a 90 confidence interval of mean annual, Basic Statistics

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If the dean wanted a 90 confidence interval of mean annual

The dean of School of Liberal Arts is interested to commission a survey to determine the starting annual salary of graduates earning a B.A. degree. A previous study had population standard deviation about $6,000. If the dean wanted a 90% confidence interval of mean annual salary of graduates with width no more than $3,000, how large a sample of graduates would she need?

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Basic Statistics: If the dean wanted a 90 confidence interval of mean annual

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