Determine whether the study is an observational study or an experiment.

A poll is conducted in which professional musicians are asked their ages.

a. Observational study
b. Experiment

The personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at the company cafeteria, or go out for lunch.

a. Observational study
b. Experiment

Step-by-step explanation:

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An observational study is one where the investigator has no control or intervenes on it. He just defines the variable of interest and merely collects and documents the information.

An experimental study or experiment is one where the investigator intervenes by defining the variable of interest and artificially manipulates the study factor. It is also one of its characteristics the randomization of cases or subjects in groups (two or more, depending on what is the hypothesis of study).

1)

In the first example, the researcher doesn't control anything about the experiment, he just asks the professional musicians their age.

This is an observational study.

2)

In this second example, there is also no intervention of the researcher, she just asks her employees where they eat their lunch. This example is also an observational study.

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step-by-step explanation:

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hj=3x+20

ji=15x-64