Montarello and Martin (2005) found that 5th grade students completed more math problems correctly when simple problems were mixed with their regular math assignments. To further explore this phenomenon, suppose that a researcher selects a standardized math test that produces a normal distribution of μ = 90 and a standard deviation of 8. The researcher modifies the test by inserting a set of very easy problems among the standardized questions, and gives the modified test to a sample of 25 students. If the average test score for the sample is M = 98, is this result sufficient to conclude inserting the easy questions improves student performance? Use a one-tailed test with α = 0.05.
Montarello and Martin (2005) found that 5th grade students completed more math problems correctly when simple problems were mixed with their regular math assignments. To further explore this phenomenon, suppose that a researcher selects a standardized math test that produces a
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