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GreenBeam Limited claims that its compact fluorescent bulbs average no more than 3.27 mg of mercury. A sample of 65 bulbs shows a mean of
GreenBeam Limited claims that its compact fluorescent bulbs average no more than 3.27 mg of mercury. A sample of 65 bulbs shows a mean of 3.34 mg of mercury.
(a) State the hypotheses for a right-tail test, using GreenBeam's claim as the null hypothesis about the mean.
(b) Assuming a known standard deviation of 0.21 mg, calculate the z test statistic to test the manufacturer's claim. (c) At the 5 percent level of significance (a = .05) does the sample exceed the manufacturer's claim?
(d) find the p-value.
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