a company manufactures light bulbs. the company wants to have a mean life span o

Question

a company manufactures light bulbs. the company wants to have a mean life span of 1000 hours. a sample of 16 CRITICAL THINKING PART IV (RESULTS) Problem: A company manufactures light bulbs. The company wantsthe bulbs to have a mean life span of at least 1000 hours. A sample of 16 light bulbs is randomly selected and tested. The mean life span of the sample is 1015 hours and the standard deviation is 25 hours. Assuming the life spans are approximately normally distributed, you construct a 95% confidence interval for the mean life span of these bulbs, obtaining the interval: 102.75 u

Explanation / Answer

here as the confidence interval upper limit is 1029.2 and mid point is 1015 hence interval should be from 1000.8 to 1029.2.

threrefore oiption b seems to be correct

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