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A researcher reports survey results by stating that the standard error of the mean is30. The population standard deviation is600. Use z -table. a. How

A researcher reports survey results by stating that the standard error of the mean is30. The population standard deviation is600. Usez-table.

a.How large was the sample used in this survey?

b.What is the probability that the point estimate was within15 of the population mean?

(to4decimals)

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