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The weights of all of the Utah County Fair pigs have an unknown mean and known standard deviation of = 18. A simple random sample

The weights of all of the Utah County Fair pigs have an unknown mean and known standard deviation of = 18. A simple random sample of 100 pigs is found to have a sample mean weight of x = 195. If the researcher wanted to have 90% confidence in the results with a margin of error of 6.8, how many pigs must be sampled?

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