Radon is a colorless, odorless, invisible gas that seeps into residential homes and has been linked to lung cancer. A generally acceptable safe level of radon is 4 pCi/L.  A radon detection device measures the radon level once per hour at a randomly selected time throughout a one-week period. Then it calculates the mean radon level for the sample of measurements. Based on the sample results, the device performs a test of H0: µ = 4 versus Ha :  µ > 4, where µ is the true mean radon level. (c) Describe a Type II error. (d) Give a consequence of making a Type II error. (e) Which error is more serious?  Why?

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A: HYPOTHESIS  H0 :μ = 105H1 :μ < 105 test statistic z = x-μsn=105 -102.54.930=2.38

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A:

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A:

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A:

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