Experiments

Question 1

Explanatory Variable:

Answer 1

The variable that you are in control of.

Question 2

Response Variable:

Answer 2

The variable you measure - it changes as a result of changing the explanatory variable.

Question 3

Extraneous Variable:

Answer 3

Any other variables (not explanatory or response) that could affect the experiment.

Question 4

What is a laboratory experiment:

Answer 4

An experiment carried out where all extraneous variables are controlled.

Question 5

What is a field experiment:

Answer 5

An experiment carried out in the natural environment (real life). The scientist has less control over extraneous variables.

Question 6

What is a natural experiment:

Answer 6

The explanatory variables are not changes or are very difficult to control.

Question 7

What are matched pairs:

Answer 7

Members of the population are paired up based upon height, weight etc.
One member becomes part of the control group and one the experimental group.

Question 8

What are control groups:

Answer 8

The control group is used a reference to compare the effects of the experiment on. They may be given a placebo if it fits the experiment as all extraneous variables are meant to be kept constant across both groups.

Question 9

What are before-and-after tests:

Answer 9

An experiment which tests the same group of people pre and post the experiment to see the effect on a group of people.