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September 15, 2014

September 15, 2014

Posted by **Kathy** on Tuesday, November 2, 2010 at 11:05am.

- Statistics -
**Dianne**, Thursday, November 11, 2010 at 8:05pmTwenty students randomly assigned to an experimental group receive an

instructional program; 30 in a control group do not. After 6 months, both groups

are tested on their knowledge. The experimental group has a mean of 38 on the

test (with an estimated population standard deviation of 3); the control group

has a mean of 35 (with an estimated population standard deviation of 5). U

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