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.