I have this problem:
Twenty 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).
Using the .05 level, what should the experimenter conclude? Restate the question as a research hypothesis and a null hypothesis about the population. Should the experimenter accept or reject the null hypothesis? Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
I have to use Excel to place in the answers. Can anyone please help me! This is due in a few hours and I am completely lost. p.s. I have posted this with an attachment of the excel sheet.
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