Question

In which of the following do the researchers divide the subjects into groups?

A. controlled experiment
B. observational study
C. survey​​

Answer 1

OBSERVATION STUDY

Step-by-step explanation:

is observational study because experiment deals with using your eyes to observe what you see and bring out experiments

Answer 2

In a controlled experiment, the researchers divide the subjects into groups by randomly assigning participants to different groups: one group receives the treatment or experimental manipulation, while the other group serves as the control group.

Step-by-step explanation:

In a controlled experiment, the researchers study by dividing the subjects into groups. They do this by randomly assigning participants to different groups: one group receives the treatment or experimental manipulation, while the other group serves as the control group. This allows researchers to compare the groups and determine the effects of the independent variable on the dependent variable.