# BIOL132 - L7

• Created by: Katherine
• Created on: 07-06-16 21:56
What does a correlation do>
It illustrates the direction and strength of a relationship between 2 variables e.g. height and shoe size.
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WHat is used to illuastrate this correlation?
Scatterplot
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What is a positive correlation?
High scores on one variable associated with high scores on another
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What is a negative correlation>
A negative correlation is the opposite; high scores on one variable are linked with low scores on another.
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What is correlation measure on?
A scale of +1 = perfect positive correlation, 0 = no correlation, -1 = perfect negative correlation.
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What is pearson's correlation coefficient
r=1 - it is the most common measure of correlation.
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What does pearson's correlatino coefficient assume?
It assumes continous data (if not then use spearman's test0, linear relationship between variables - measures linear correclation.
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How do you determine is scores on one variable predict or explain those on another>
Square the correlation number and multiply by 100.
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Give an example of this:
Correlation between number of session and satisfaction = 0.5, so 25% of variability can be predicted of satisfaction. 75% remains unexplained
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What is regression?
It is the relaationship between variables.
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What is regression used for?
To caluclate line of best fit.
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## Other cards in this set

### Card 2

#### Front

WHat is used to illuastrate this correlation?

Scatterplot

### Card 3

#### Front

What is a positive correlation?

#### Back ### Card 4

#### Front

What is a negative correlation>

#### Back ### Card 5

#### Front

What is correlation measure on?

#### Back 