correlations

Question 1

what is a correlation

Answer 1

• illustrates the strength and direction of an association between two or more covariables
• plotted on a scattergram

Question 2

what is the difference between correlation and experiments

Answer 2

• in an experiment the researcher control the IV in order to ensure the effect on the DV so is sure that any changes to the DV is due to the IV
• in a correlation there is no manipulation of one variable and therefore it is not possible to establish a cause and effect between the co variables

Question 3

strength of correlation

Answer 3

1. useful preliminary tool for rescher
   - by assessing the strength and direction of a relationship they provide a precise and quantifiable measure of how 2 variables are related
   - many suggest ideas for possible future research if variables are strongly related
2. quick and economical to carry out
   - no need for a controlled environment and no manipulation of variables ids required
   - data collected by others can be used so less time consuming

Question 4

limitations of correlations

Answer 4

1. can only tell us how variables are related but not why
   - cannot demonstrate cause and effect between variables so we do not know what caused the change
2. may be a third variable
3. can be misused or misinterpreted

Question 5

what value represent a perfect positive correlation

Answer 5

+1

Question 6

what value represents a perfect negative correlation

Answer 6

-1