A consumer protection group believes that the mean lifetime of a certain brand o

Question

A consumer protection group believes that the mean lifetime of a certain brand of lithium batteries is less than the 1000 hours claimed on the package. Based on a random sample of 18 batteries, it is found that: Test statistic t=-2.26 P-Value = 0.0185 Choose the correct conclusion for significance level = 0.01. a) Reject H0. There is not enough evidence to conclude the true mean lifetime is less than 1000 hours. b) Reject H0. There is enough evidence to conclude the true mean lifetime is less than 1000 hours. c) Do not reject H0. There is not enough evidence to conclude the true mean lifetime is less than 1000 hours. d) Do not reject H0. There is enough evidence to conclude the true mean lifetime is less than 1000 hours.

Explanation / Answer

Since the P-value is > 0.01, the correct answer is d): Do not reject H0. There is enough evidence to conclude the true mean lifetime is less than 1000 hours.

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