Question

question 6: determine whether the study described below is an observational study or a randomized experiment. eighty patients with severe arthritis are randomly divided into two groups. one group is treated weekly with both acupuncture and an exercise regimen. the other is treated weekly with the exact same exercise regimen, but no acupuncture. after 1 year, both groups are questioned about their level of pain due to their arthritis. o observational study o randomized experiment question 7: school psychology a school psychologist wants to test the effectiveness of a new method for teaching arithmetic using a randomized experiment. she recruits 500 second - grade students in the local school district and randomly divides them into two groups. group 1 is taught by means of the new method, while group 2 is taught by traditional methods. the same teacher is assigned to teach both groups. at the end of the year, an achievement test is administered and the results of the two groups are compared. identify the subjects (experimental units). o 500 second - grade students o the 250 students in group 1 o the 250 students in group 2

Explanation:

Question 6

In a randomized experiment, the researcher manipulates the treatment variable. Here, patients are randomly divided and one group gets a treatment (acupuncture with exercise) while the other gets just exercise. In an observational study, no treatment is assigned. Since treatments are assigned, it's a randomized experiment.

The experimental units are the entities to which the treatments are applied. Here, the treatments (new teaching method and traditional method) are applied to the second - grade students. So, the second - grade students are the experimental units.

Answer:

Randomized experiment

Question 7