The Average Life of a Certain Type and Brand of Battery

question 11

Short Answer

The average life of a certain type and brand of battery is 75 weeks. The average life of each of 9 randomly selected batteries is listed below.
74.5, 75.0, 72.3, 76.0, 75.2, 75.1, 75.3, 74.9, 74.8
a. Assume the battery life distribution is normal. It is of interest to know if the sample data suggest the average life is smaller than 75 weeks.
b. Compute the test statistic for the hypotheses in part (a).
Test statistic = ______________
c. Compute the approximate p-value associated with the test statistic in (b).
P-value = ______________
Conclusion: ______________
The sample data ______________ support the alternative hypothesis at the
= 0.05 level.

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Definitions:

Predation

The biological interaction where one organism, the predator, kills and consumes another organism, its prey, as a food source.

Flocks

Groups of birds gathered together, typically for the purposes of migration or social interaction.

Indigenous Peoples

Ethnic groups who are the original inhabitants of a region, before the colonization or annexation of their territory by other populations, and who maintain traditions or aspects of an early culture associated with that region.

Crops Grown

Plants that are cultivated on a large scale for food, fuel, fiber, or feed.