Question: Using a paired samples t-test a researcher tests the claim that students who take an ACT prep course achieve higher test scores. Based on this

Using a paired samples t-test a researcher tests the claim that students who take an ACT prep course achieve higher test scores. Based on this test, they determine that there is a significant difference between groups. However, Using confidence intervals, the researcher finds that there is not a significant difference between groups. What is the mostly likely cause for this discrepancy (outside of calculation errors)?

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