The manufacturer claims that the average lifetime of their lightbulb is 3 years or 36 months. The standard deviation is 7 months. 50 bulbs are selected, and the average life expectancy is found to be 33 months. Should the manufacturer statement be rejected at level of significance 0.05. Please show your solution.

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03-12-2022
Math

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The manufacturer claims that the average lifetime of their lightbulb is 3 years or 36 months. The standard deviation is 7 months. 50 bulbs are selected, and the average life expectancy is found to be 33 months. Should the manufacturer statement be rejected at level of significance 0.05. Please show your solution.

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