An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 45 hours. How large a sample is needed if we wish to be 98% confident that our sample mean will be within 14 hours of the true mean?

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A:

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Q: 12.7  Determine the test statistic.   Determine the​ P-value.   Determine the proper conclusion…

A: Right-HandedLeft-HandedFemale857871879857874886785847896813Male94410019099169031030913915947977

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A: Sample 1:Sample size Sample mean Sample standard deviation Sample 2:Sample size Sample mean Sample…