# Estimation: Confidence Interval for the mean.

Not what you're looking for? Search our solutions OR ask your own Custom question.

In a certain manufacturing process, the diameter of holes drilled in a steel plate is a normally distributed random variable. The process standard deviation is known to be s =0.005 cm. A sample of 15 plates shows a mean hole diameter of 2.475 cm. Find the 95 percent confidence interval for Mean (M).

Â© BrainMass Inc. brainmass.com March 4, 2021, 8:27 pm ad1c9bdddfhttps://brainmass.com/statistics/confidence-interval/estimation-confidence-interval-mean-169529

#### Solution Preview

In a certain manufacturing process, the diameter of holes drilled in a steel plate is a normally distributed random variable. The process standard deviation is known to be s =0.005 cm. A sample of 15 plates shows a mean hole diameter of 2.475 cm. Find the 95 ...

#### Solution Summary

95 percent confidence interval for Mean has been calculated. The expert provides estimations.

$2.49