Test Hypotheses About a Population Mean with Unknown
-A Manufacturer $\alpha = 0.05$

question 63

Short Answer

Test Hypotheses about a Population Mean with Unknown
-A manufacturer claims that the mean lifetime of its lithium batteries is 1000 hours. A homeowner selects 25 of these batteries and finds the mean lifetime to be 990 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use $\alpha = 0.05$ .

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Definitions:

Apprehensive

Feeling anxious or fearful about the future; uneasy.

Hallucinations

Perceptions in a conscious and awake state in the absence of external stimuli, which have qualities of real perception.

Depression

A common and serious mood disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities.

Loss Of Appetite

A decrease in the desire to eat, which can be a symptom of various underlying conditions, affecting nutritional intake and overall health.