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please solve as soon as possible. A researcher reports survey results by stating that the standard error of the mean is 40. The population standard

please solve as soon as possible.

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A researcher reports survey results by stating that the standard error of the mean is 40. The population standard deviation is 560. Use 2-table. a. How large was the sample used in this survey? b. What is the probability that the point estimate was within 1:20 of the population mean? (to 4 decimals)

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