A researcher is studying the relative effectiveness of different tutoring strategies for helping students learn mathematics, She is using 9th graders from a large high school as her subjects. Her dependent variable is the score on a monthly mathematics test given to all 9th graders In the school. For each experimental scenario below, choose all tests that could be used for that scenario. Assume that the relevant assumptions for the populations (type of distribution, variance, etc.) are satisfied. Independent-samples t test (a) The researcher is studying two tutoring strategies. She selects 40 students and places them in equal-ability Dependent-samples t test pairs based on their past achievement. One student in the pair receives help from one strategy, and the other One-way, Independent-samples ANOVA student in the pair receives help from the other One-way, repeated-measures ANOVA strategy. Two-way (independent-samples) ANOVA Independent-samples t test (b) The researcher is studying two tutoring strategies. She D Dependent-samples t test randomly selects 80 students, separates them at random into two groups, and assigns a different One-way, independent-samples ANOVA strategy to each group. One-way, repeated-measures ANOVA O Two-way (independent-samples) ANOVA (c) The researcher is studying five tutoring strategies. She Independent-samples t test is looking both at the relative effectiveness of the strategies and at the possible influence of gender. She Dependent-samples t test randomly selects 40 male students and 40 female One-way, Independent-samples ANOVA students. She divides the males into groups of 8 and assigns a different strategy to each group. She does D One-way, repeated-measures ANOVA the same for the females. Two-way (independent-samples) ANOVA