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Category > Statistics Posted 28 May 2017 My Price 7.00

A researcher reports survey results by stating that the standard error of the mean is 20

48.      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?

49.      A production process is checked periodically by a quality control inspector. The inspector selects simple random samples of 30 finished products and computes the sample mean product weights x¯. If test results over a long period of time show that 5% of the x¯ values are over 2.1 pounds and 5% are under 1.9 pounds, what are the mean and the standard deviation for the population of products produced with this process?

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Alpha Geek
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Status NEW Posted 28 May 2017 10:05 AM My Price 7.00

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