The control group had a standard deviation of 7.78 on the pretest. Does this standard deviation represent nominal, ordinal, or interval scale data?
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Interval scale data is used to deal with the degree of differences between values and to make arithmetic assumptions.
The control group had a standard deviation of 7.78 on the pretest.
This means there are a number of pretest scores in the control group and the difference between these values is an average of 7.78, hence 7.78 being the standard deviation.
At regular difference, the scores tend to show up. So, the standard deviation represents interval scale data.
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