25. A researcher wants to investigate whether there is a difference in engaging in criminal acts between those who have a high school diploma or higher and those who have not obtained a HSD. They collect a sample of 61 non-HSD adults and a sample of 61 HSD adults in Arizona and does a records check to see determine how many arrests they have had in the past. Assume that the variances are equal. (7 points) a. State the null and research hypotheses. b. Find the tcrit value for an independent-samples t-test (with an alpha of .01), and calculate the degrees of freedom. c. Calculate the obtained t-statistic, and state the decision you make based on the results, interpreting. d. If significant, calculate Cohen's d and interpret the strength of the relationship. Non-HSD Adults HSD Adults Mean = 3.5 arrests Mean = 3.1 arrests S1=1.22 S2=1.25 n1=61 $2-61