Montarello and Martins found that fifth-grade students completed more mathematics problems correctly when simple problems were mixed in with their regular assignments. To further explore this phenomenon, suppose that a researcher selects a standardized mathematics achievment test that produces a normal distribution of scores with a mean of u=100 and a standard deviation of o=18. The researcher modifys the test by inserting a set of very easy problems among the standardized questions, and gives the modified test to a sample of n=36 students. If the average test score for the sample is M=104, is this result sufficient to conclude that inserting the easy questions improves student performance? Use a one-tailed test with Alpha=.01. STep 1: State the hypotheses and set the alpha level. Use both symbol and words How many tail(s)? Step 2: locate the critical region state the critical region. Step 3 compute the test statistic (in this case, the z-score) for the sample