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A professor wanted to determine whether an online homework system improved scores on a final exam. In the fall semester, he taught a class using the online homework system (which meant students did their homework online and received instant feedback about their answers along with helpful guidance). In the spring semester, he taught a class without the homework system (which meant students were responsible for doing their homework the old-fashioned way - paper and pencil). The professor made sure to teach the two courses identically (same text, syllabus, tests, meeting time, meeting location, and so on). The table summarizes the results of the two classes on their final exam. Complete parts (a) through (e) below. Click the icon to view the table. (a) What type of experimental design is this? i Summary data O A. Retrospective study O B. Randomized blocked design Fall semester Spring semester O C. Completely randomized design Number of students 29 25 O D. Prospective study Mean final exam score 71.2 69.5 Standard deviation final exam 9.1 13 (b) What is the response variable? score O Syllabus O Final exam scores Print Done O Location O Homework system O O Text Test O Teacher O WeatherWhat are the treatments in the study? Select all that apply. E] Location E] Text I] Syllabus E] Weather E] Homework system C] Teacher E] Test E] Final exam scores (0) What factors are controlled in the experiment? Select all that apply. I] Weather E] Test E] Homework system C] Final exam scores I] Teacher E] Location I] Syllabus E] Text (d) In many experiments, the researcher will recruit volunteers and randomly assign the individuals to a treatment group. In what regard was this done for this experiment? 0 A. The assumption is that the students were selected for each course. 0 B. The assumption is that the students knew about the experiment and choose to be in one of the two classes. 0 C. The assumption is that the students "randomly" enrolled in the course. 0 D. No assumptions were made for this experiment. (6) Did the students perform better on the nal exam in the fall semester? Use an a = 0.01 level of signicance. State the null and alternative hypotheses. O A' H0: "fall =Pspring O 3' H0: \"fall >\"spring H1 3 "fall > Pspring H1: P'fall