Question

1. which task is not a component of an observational study? 1) the researcher decides who will make up the sample. 3) the researcher gathers data from the sample, using surveys or taking measurements. 2) the researcher analyzes the data received from the sample. 4) the researcher divides the sample into two groups, with one group acting as a control group. justify your response:

Explanation:

In an observational study, the researcher observes and collects data without manipulating variables or creating control groups (that's done in experimental studies). Task 4 involves dividing the sample into a control group, which is a manipulation typical of experiments, not observational studies. Tasks 1 (sampling), 2 (data analysis), and 3 (data collection) are part of observational studies.

Answer:

1. The researcher divides the sample into two groups, with one group acting as a control group.