Percentage of defective items in the shipment

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1. A university official wants to estimate, with 99% confidence and within $2, the average amount that members of fraternities and sororities spend at local restaurants during the first week of the semester. If the total fraternity/sorority membership is 300 people, how many members should be included in the sample? Use (and explain) your own estimate for the population standard deviation.

2. A quality-management supervisor believes that no more than 5% of the items in a recent shipment of 2000 are defective. If she wishes to determine, within 1 percentage point and with 99% confidence, the percentage of defective items in the shipment, how large a simple random sample would be necessary?

Reference no: EM13977604

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