A methods and measurements analyst for Digital Devices needs to develop a time standard for the task of assembling a computer mouse. In a preliminary study, she observed one of her workers perform this task six times with the following results:
How many observations should be made if she wants to be 86.64 percent confident that the maximum error in the observed time is 0.5 second? Assume that the standard deviation of the task time is 4 seconds.
Definitions:
Reverse Control Groups
An experimental design element where the groups are reversed to check the effect of the independent variable in a new set of conditions or with different subjects.
Experimenter Bias
A form of bias introduced by the experimenter whose expectations about the outcome of the experiment can be subtly communicated to the participants.
Subject Bias
A form of bias introduced into scientific or experimental research by participants' expectations, treatment, or response to the knowledge that they are being observed.
Sampling Effect
A statistical effect in which the observed variability is not representative of the underlying population due to the sample size or method of selection.
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