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A teacher wants to see if a new unit on fractions is helping students learn. She has five randomly selected students take a pre-test and a post test on the material. The scores are out of 20. Has there been improvement? (pre-post) Student: 1, 2, 3, 4, 5 Pre-test: 15, 14, 15, 19, 14 Post-test: 19, 13, 12, 20, 18 What is the point estimate of the population mean difference between the pre and post test? A) -1 B) 0 C) Unknown D) 1.96
Sagot :
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