A researcher wants to evaluate the impact of participating in extracurricular activities (such as drama, debate, clubs) on a highschool students self steem compared to not participating in such activities. The researcher gets a list of all high schools in the state then sends a survey to all the students at 15 randomly selected highschools. The survey asks questions about the student self esteem and their extracurricular activities. IN total, the research sends out 45000 survey and receives 30,000 completed surveys in return. Is this an example of an experiment or observational study?

What type of sampling method did the researcher use? What is the population for this study?

a) Observational study

b) Simple random sampling.

c) The population is 30,000

Step-by-step explanation

Is this an example of an experiment or observational study

Observational study

We know that an observational study is one that the researcher observe the effect of a risk factor, diagnostic test, treatment or other intervention without trying to change who is or isn't exposed to it.In this case we are told that the survey asks questions about the student self esteem and their extracurricular activities so we can see that the researcher is not trying to control anything so it becomes an observational study

What type of sampling method did the researcher use

Simple random sampling.

We know that in simple random sampling,every member of the population has the same probability to be included to the sample.The fact that we are told that the researcher got a list of all high schools in the state and sent a survey to all the students at 15 randomly selected high schools is enough to tell us that the schools were randomly selected.

What is the population for this study

The population is 30,000 since that is the number of full surveys that he got from the schools selected