A popular brand of disposable AAA battery has an advertised capacity of 1150 mAh

Question

A popular brand of disposable AAA battery has an advertised capacity of 1150 mAh.  A consumer advocacy group tests 30 of the batteries and finds a mean capacity of 1080 mAh and a sample standard deviation of 150 mAh.  The researcher is interested in finding evidence at the .01 significance level that the batteries have a mean capacity that is lower than the advertised value.

a. p-value < .01 b. .01 < p-value < .05 c. .05 < p-value < .10 d. .10 < p-value < 1 e. p-value > 1

Explanation / Answer

.01 < p-value < .05 b. .01 < p-value < .05

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