Question

A random sample of 100 ball bearings selected from a

shipment of 2000 ball bearing has an average diameter of 0.354 inches with standard deviation 0.048 inches. The 95% confidence interval for the average diameter of these 2000 ball bearings is:

A 0.354 ± 1.96 × 0.048

B 0.354 ± 1.96 × 0.0047

C 0.354 ± 0.048

D 0.048 ± 1.96 × 0.354

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Solution