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A researcher reports survey results by stating that the standard error of the mean is 20. The population standard deviation is 480. Use z-table. a.

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A researcher reports survey results by stating that the standard error of the mean is 20. The population standard deviation is 480. Use z-table. a. How large was the sample used in this survey? b. What is the probability that the point estimate was within :|:15 of the population mean? (to 4 decimals)

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