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Question
A manufacturer of cell phone batteries claims that the median life of a battery is more than 40 hours. Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours. Using 
= .05, can we conclude that the battery life is more than 40 hours?
A. Reject the null hypothesis; z = 1.38.
B. Do not reject the null hypothesis; z = 1.38.
C. Reject the null hypothesis; z = -1.38.
D. Do not reject the null hypothesis; z = -1.38.
Answer
This answer is hidden. It contains 2 characters.
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