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

question 32

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 indicates that the machine is
not working properly.

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Definitions:

Dependent Variable

In research, it's the variable that is tested and measured, often to see the effects of variations in the independent variable.

Researcher's Manipulation

The deliberate alteration of variables by a researcher in an experiment to determine cause and effect relationships.

Independent Variable

A variable that is manipulated or changed in an experiment to determine its effect on a dependent variable.

Dependent Variable

In an experimental setting, the variable that is being tested and measured, which is expected to change as a result of manipulations in the independent variable.