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One group of science students have an average score of 90 with an SD of 40. The second group of science students have an average score of 80 with an SD of 30. The first group contains 400 students, while the second group only contains 100 students. What would be the difference between the two groups’ averages? 10 give or take 3.6 11 give or take 4.6 9 give or take 2.2 8 give or take 3.6 10 give or take 2.6

You may use the calculator above and this area as scratch paper. To see the solution just click on the button.

Carlos Rodriguez <carlos@math.albany.edu>

This problem was contributed by a student in Elementary Statistics. It is offered as it is with no warranty of any kind
Last modified: Wed May 13 12:29:11 EDT 1998