Key Science Skills Flashcards
Hypothesis
Prediction of results
- Must include IV, DV, population and direction
Experimental group
Sample that have the IV applied
Control group
Sample without IV applied, baseline measurement
Extraneous Variables
A variable other then IV that can influence the DV
Confounding Variables
An extraneous variable that influences the DV
What are the experimental designs?
Between subjects design
Within subjects design
Mixed subjects design
Between Subjects Design
controlled group or the experimental group
Within Subjects Design
Completes the control group and the experimental group
Mixed Subjects Design
Testing before and after the experiment
Aim
What you’re trying to achieve
IV
What’s changing
Dv
What’s being measured
Internal Validity
If the investigation investigates what it claims to investigate.
Quantitative
Number measurement.
eg. 14
Qualitiative
Categorical
Mode
Most frequent value
Median
The middle number in an ordered set of data
Mean
sum of all the values divided by the total number of values
Internal Validity
Investigation truly investigates what it claims to
External Validity
ability to generalise
Range
difference between the highest and lowest values
Interquartile range
range of the middle half
Standard deviation
average distance from mean
Variance
average of squared distances from mean
