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Twenty students randomly assigned to an experimental grorup receive a n 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(est. populationastandard deviation of 3): the control group has a mean of 35(est. population standard deviation of 5). Using the ,05 level, what should the experimenter conclude? a)the the steps od hypothesis testing b)sketch the distribution involved, and c) explain your answer to someone who is familiar with the t test for a single sample but not with the t sest for independent means.

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