In a Metal Fabrication Process, Metal Rods Are Produced to a Specified

Multiple Choice

In a metal fabrication process, metal rods are produced to a specified target length of 15 feet.Suppose that the lengths are normally distributed.A quality control specialist collects a random sample of 16 rods and finds the sample mean length to be 14.8 feet and a standard deviation of 0.65 feet.The 95% confidence interval for the true mean length of rods produced by this process is ________________________ .

A) 14.544 to 15.056 ft
B) 14.345 to 15.255 ft
C) 13.912 to 15.688 ft
D) 14.454 to 15.146 ft
E) 13.834 to 15.766 ft