correlations Flashcards
1
Q
how do correlations differ from experiments?
A
- variables are measured, not manipulated
- only an association is found, no cause and effect relationship is established
2
Q
what is a negative correlation?
A
when 1 variable increases, the other decreases
- negative gradient on scattergram
- correlation coefficient of less that 0
3
Q
what is a positive correlation?
A
when 1 variable increases, the other variable also increases
- positive gradient
- correlation coefficient of more than 0
4
Q
what is zero correlation?
A
no relationship found between co-variables
- no line of best fit can be drawn
- correlation coefficent of 0
4
Q
give 3 limitaions of correlations
A
- hard to establish a cause and effect relationship
- third variable problem is increased
- correlations are often misued by media
4
Q
give 3 strengths of correlations
A
- quick and economical to carry out
- secondary data can be used so less time consuming
- can be used as starting points to assess patterns between co-variables before committing to an experiment
