Question

Many cardiac patients wear an implanted pace- maker to control their heartbeat. A plastic connec- tor module mounts on the top of the pacemaker. As- suming a standard deviation of 0.0015 inch and an ap- proximately normal distribution, find a 95% confidence

interval for the mean of the depths of all connector modules made by a certain manufacturing company. A random sample of 75 modules has an average depth of 0.310 inch.

Answer 1

The 95% confidence interval for the mean depth is approximately [0.3072, 0.3128] inches.

Identify parameters:

Standard deviation (σ) = 0.0015 inch