Question

GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.45 mg of mercury....

GreenBeam Ltd. claims that its compact fluorescent bulbs average no more than 3.45 mg of mercury. A sample of 55 bulbs shows a mean of 3.57 mg of mercury.

(a) State the hypotheses for a right-tailed test, using GreenBeam’s claim as the null hypothesis about the mean.

  1. H0: μ ≤ 3.45 mg vs. H1: μ > 3.45 mg

(b) Assuming a known standard deviation of 0.26 mg, calculate the z test statistic to test the manufacturer’s claim. (Round your answer to 2 decimal places.)

Test statistic =

(d) Find the p-value. (Round intermediate calculations to 2 decimal places. Round your answer to 4 decimal places.)

p-value =   

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Answer #1

P=0.0003

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