Average Battery Life Narrative

question 40

Essay

Average Battery Life Narrative
The average life of a certain type and brand of battery is 75 weeks. The average life of each of nine randomly selected batteries is as follows: 74.5, 75.0, 72.3, 76.0, 75.2, 75.1, 75.3, 74.9, and 74.8. Assume the battery life distribution is normal. Do the sample data suggest the average life is smaller than 75 weeks?
-Refer to Average Battery Life Narrative. Compute the test statistic for the hypotheses in the previous question.

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