SCENARIO 8-2 A Quality Control Engineer Is Interested in the Mean Length

question 85

True/False

SCENARIO 8-2
A quality control engineer is interested in the mean length of sheet insulation being cut
automatically by machine.The desired mean length of the insulation is 12 feet.It is
known that the standard deviation in the cutting length is 0.15 feet.A sample of 70 cut
sheets yields a mean length of 12.14 feet.This sample will be used to obtain a 99%
confidence interval for the mean length cut by machine.
-True or False: Referring to Scenario 8-2, the confidence interval is valid only if the lengths
cut are normally distributed.

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