Does each situation describe a survey, an experiment, or an observational study?

select survey, experiment, or observational study for each situation.

survey,experiment,observational study

patients who visit a clinic for the first time are asked to answer 15 questions about their health history.

a researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. a randomly chosen group of 20 patients who come in with the flu receive a placebo.

a doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.

Patients who visit a clinic for the first time are asked to answer 15 questions about their health history.

Survey

A researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. A randomly chosen group of 20 patients who come in with the flu receive a placebo.

Experiment

A doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.

Observational Study

A survey : survey sampling is the process of selecting a sample of elements from a target population to conduct any survey.

An experiment : an experiment is a procedure that can be infinitely repeated and can have many possible outcomes.

An observational study - observational studies are done to understand cause and effect relationships.

Survey  - Patients who visit a clinic for the first time are asked to answer 15 questions about their health history.  

Experiment - A researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. A randomly chosen group of 20 patients who come in with the flu receive a placebo.

Observational Study - A doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.

(0,0)

Step-by-step explanation:

Hi there!

We are given the line segment AB, with endpoints A and B and we want to find the midpoint of it.

We can use the midpoint formula to do that, which states that the value of the midpoint can be found using the formula , where the coordinates and are the endpoints of the line segment

As stated above, the endpoints are A and B

So let's find the values of A and B

The point A is (-1, 2)

The point B is (1, -2)

Although we have the endpoints, let's label the values of the points to avoid confusion for when we calculate.

Now substitute those values into the formula to solve for the midpoint.

Simplify the numerators:

Divide

(0, 0)

The midpoint of AB is (0,0)

Hope this helps!