| Country : | Australia |
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Assignment Task:
Task:
The Question
- Are two variables related?
- Does one increase as the other increases?
- e. g. skills and income
- Does one decrease as the other increases?
- e. g. health problems and nutrition
- How can we get a numerical measure of the degree of relationship?
Correlation
Correlation: is a statistical technique used to determine the degree to which two variables are related
Scatter diagram : Graphically depicts the relationship between two variables in two-dimensional space
Two quantitative variables
- One variable is called independent (X) and the second is called dependent (Y)
- Points are not joined
An Example
- Does smoking cigarettes increase systolic blood pressure?
- Plotting number of cigarettes smoked per day against systolic blood pressure
- Fairly moderate relationship
- Relationship is positive
- Correlation
- Co-relation
- The relationship between two variables
- Measured with a correlation coefficient
- Most popularly seen correlation coefficient: Pearson
- Product-Moment Correlation
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