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Compute a sample size using a simple random sample

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Suppose you want to use a simple random sample to determine, within +/- $10 and at a 95% level of confidence, the average amount of money an OSU undergraduate student spends on text books in a semester. If you know that σ = 60, compute the sample size you need.

There are 50,000 households in a city. You want to use a simple random sample to determine, within +/- 2000 and with 95% confidence, how many of these 50,000 households filed taxes electronically in 2009. If you have no prior idea of how many, determine the sample size you need.

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