Write the hypotheses for a right-tailed test

GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.50 mg of mercury. A sample of 25 bulbs shows a mean of 3.59 mg of mercury, (a) Write the hypotheses for a right-tailed test, using GreenBeams’s claim as the null hypothesis about the mean, (b) Assuming a known standard deviation of 0.18 mg, calculate the z test statistic to test the manufacturer’s claim, (c) At the 1 percent level of significance (a = .01) does the sample exceed the manufac-turer’s claim? (d) Find the p- value.

 

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