Question: You want to estimate the difference in grade point averages between two groups of college students accurate to within .2 grade point, with probability approximately

You want to estimate the difference in grade point averages between two groups of college students accurate to within .2 grade point, with probability approximately equal to .95. If the standard deviation of the grade point measurements is approximately equal to .6, how many students must be included in each group? (Assume that the groups will be of equal size.)

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