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

question 28

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.

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