correlations u2 rm2

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6 Terms

1
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what is a correlation?

a method of data analysis which measures the strength of the relationship between two or more variables

2
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what is a positive correlation?

as one variable increases the other increases

3
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what is a negative correlation

as one variable increases the other decreases

4
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what is a correlation co-efficient

the number which shows the strength of the relationship

5
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what are the disadvantages of correlations?

Cannot show cause and effect

Cannot be assumed that one variable caused another's value

Extraneous variables could cause changes observed

6
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what are the advantages of correlations?

Can make predictions that can be tested in experiments

Correlation co-efficient useful as shows strength of a relationship