Randomization Techniques to Introduce Two-Sample Hypothesis Tests MICHAEL SULLIVAN JOLIET JUNIOR COLLEGE

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Randomization Techniques to Introduce Two-Sample Hypothesis Tests MICHAEL SULLIVAN JOLIET JUNIOR COLLEGE

Math Redesign Program at JJC Last semester, Joliet Junior College implemented a redesign of its Intermediate Algebra course. The Math Redesign Program (MRP) is a mastery-based learning model in which students work at a minimally prescribed pace in which each module must be mastered prior to moving to the next module. We wanted to determine if the MRP model results in a higher proportion of students passing the course over our traditional lecture model. During the Spring, 2015 semester, Professor Egner taught a section of each model. In her MRP class, 19 out of 24 students passed; in her traditional class, 14 out of 24 students passed. Does this evidence suggest the MRP course is superior to the traditional course in terms of pass rates?

Math Redesign Program at JJC What is the response variable in the study? What is the explanatory variable in the study? What type of experimental design is this? What or who are the experimental units in the study? Are any variables controlled? What role does randomization play in this study?

Math Redesign Program at JJC

The difference of seems significant. That is, it sure seems like the MRP course has a higher pass rate. That said, is it possible that the MRP course had a higher pass rate due to random chance? Put another way, is it possible the 33 students who passed would have passed regardless of which course they were enrolled in and they just happened to end up in the MRP course? So, there are two possibilities here: (1) the MRP course is not effective and the higher pass rate in the MRP section was due to chance. (2) The MRP course is effective and this explains the difference in pass rates.

Math Redesign Program at JJC

In a classroom setting, combine the results of the class. Consider drawing a dotplot of the differences on the board. Or, use a survey tool (such as StatCrunch) to aggregate the classroom results. Based on the classroom results, ask students if they are willing to conclude that the MRP program is superior to the traditional method with this number of observations. In reality, we need to conduct this simulation many, many times. To do this, we use an applet.

Math Redesign Program at JJC

In the 2000 repetitions of the experiment (through the applet), 217 resulted in a sample difference of or higher. We estimate the P-value to be 217/2000 = The probability of observing a sample difference in proportions of or higher under the assumption the difference in proportions is zero is

Math Redesign Program at JJC What would happen if we increased the sample size five-fold? So, we now have 95 out of 120 MRP students passing and 70 out of 120 Traditional Students passing.

Math Redesign Progam at JJC

Math Redesign Program at JJC