Mary is planning a study to see if learning of 6th graders on a math lesson is affected by background noise level. She wants to use a t-test for independent groups to analyze her results. She wants to use a t-test for independent groups to analyze her results. What are the problems that can occur with her repeated design?

Mary is planning a study to see if learning of 6th graders on a math lesson is affected by background noise level. She wants to use a t-test for independent groups to analyze her results. She wants to use a t-test for independent groups to analyze her results. What are the problems that can occur with her repeated design?

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