Posted by mike on Monday, April 29, 2013 at 7:15pm.
a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers

statistics  PsyDAG, Tuesday, April 30, 2013 at 2:30pm
The Range Rule
The range rule tells us that the standard deviation of a sample is approximately equal to one fourth of the range of the data. In other words s = (Maximum – Minimum)/4. This is a very straightforward formula to use, and should only be used as a very rough estimate of the standard deviation.
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