Suppose a statistics instructor wants to determine 1) If group study session are

Question

Suppose a statistics instructor wants to determine 1) If group study session are beneficial to students, and if so 2) whether or not the amount of time spent in group study makes a difference. Which of the following scenarios below refer to unblased, controlled experiments that the instructor could run in order to answer one of these two research questions? For all of these scenarios, assume that the instructor is keeping track of the grades of all students in the class. Select all that apply. You have four tries, and you must pick only the correct scenarios for credit. The instructor puts all of the freshmen in the class into one group, all of the sophomores into another, all of the junions into another, and finally all of the seniors into another. The instructor then randomly picks a certain number of hours for each group to study per week. Each student in the class keeps a log of the hours he/she spends studying in a group. Students report the total number of study hours after the course is completed. Four groups are set up, students in the first group are assigned to not study at all. Students in the second group are assigned to study on an individual basis. Students in the 3rd group are assigned to study 2 hours per week. Students in the 4th group are assigned to study 4 hours per week. Students then choose which group they want to be in. Students are randomly assigned to four groups. Each group votes on how much studying they will do, and then studies that amount each week. Students are randomly assigned to four study groups. The instructor assigns a different number of study hours to each group. Students are randomly assigned to two groups. One is assigned to only study on an individual basis, while the other is assigned to participate in group study sessions.

Explanation / Answer

If you want to test the group study is beneficial to students or not. And aslo test time spent on study is significant or not. Such experiments are unbised if and only if you follow the following rules:

For study of this experiments you should first divide all the students in the several groups that is first group for not study, second for individual study, third group for 2 hours per week group study and fourth one is 4 hours per week group study, and then select students randomly from each group.

that is from top third option is correct answer.

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