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A random sample of 16 bulb was tested to estimate the average life of this type...

A random sample of 16 bulb was tested to estimate the average life of this type of bulb under normal using conditions in a certain city. The sample mean and sample standard deviation were found to be 47500 hours and 4200 hours, respectively.

a. Calculate the margin of error for a 95% confidence interval estimate of the mean lifetime of this type of bulb if used under normal using conditions.

b. Find the LCL of a 90% confidence interval estimate of the mean lifetime of this type of bulb if used under normal using conditions.

c. Find the UCL of a 90% confidence interval estimate of the mean lifetime of this type of bulb if used under normal using conditions.

Math   Statistics-And-Probability   
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