Experimental Design

Question 1

3 things that make an investigation

Answer 1

Randomisation
Sample size
Replication
Control

Question 2

Variables

Independent

Answer 2

The one you change

Question 3

Variable

Dependent

Answer 3

The one you measure

Question 4

Variable

Control

Answer 4

The one you keep the same

Question 5

Mean

Answer 5

Average

Sum of all numbers divided by amount of numbers

Question 6

Mode

Answer 6

Most common number

Question 7

Median

Answer 7

Is the halfway point when all variables are in order from smallest to largest

Question 8

Standard deviation

Answer 8

Is a measure of the spread in a data set

Gives an idea of how far data is spread from the mean

Question 9

Factors to improve validity

Answer 9

Replication
- increases accuracy

Larger sample size
Complete experiment in different areas

Randomisation
- preventing bias during sampling and treatment of the results

Controlling variables
- only have one variable that changed and try to keep all others the same