Question

A medical engineering company creates x-ray machines. The machines the company sold in 1995 were expected...

A medical engineering company creates x-ray machines. The machines the company sold in 1995 were expected to last six years before breaking. To test how long the machines actually lasted, the company took a simple random sample of six machines. The company got the following results (in years) for how long the x-ray machines lasted: 8, 6, 7, 9, 5, and 7. Assume the distribution of the longevity of x-ray machines is normally distributed. Construct a 98% confidence interval for the average longevity of x-ray machines. What the standard error of the sample mean in this case?

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Answer #1

A medical engineering company creates x-ray machines. The machines the company sold in 1995 were expected to last six years before breaking.

The given data is

8, 6, 7, 9, 5, 7

Therefore the 98% confidence interval for the average longevity of x-ray machines is (5.06, 8.94)

Standard error = 0.58

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