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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 500. a. How large was the sample used in this survey? b. What is the probability
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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 500.

a. How large was the sample used in this survey?
b. What is the probability that the point estimate was within ±25 of the population mean?

User Kannappan
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multiply 20 by 500. it should help you with the problem.

User Kksensei
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