What is Scatter Plot?
Definition
Scatter Plot shows the relationship between independent variables and dependent variables graphically. A Scatter Plot contains independent variables on the x-axis and dependent variables on the y-axis.
Terminologies
Linear Correlation: changes in one variable tend to be proportional to changes in the other
Perfect Positive Linear Correlation: If Y increases at a constant rate as X increases.
Perfect Negative Linear Correlation: If Y decreases at a constant rate as X decreases.
Terminologies
Linear Correlation: changes in one variable tend to be proportional to changes in the other
Perfect Positive Linear Correlation: If Y increases at a constant rate as X increases.
Perfect Negative Linear Correlation: If Y decreases at a constant rate as X decreases.
Line of best fit
Is the straight line that passes as close as possible to all of the points on a scatter plot.
Note:
The stronger the correlation, the more closely the data points cluster around the line of best fit.
Note:
The stronger the correlation, the more closely the data points cluster around the line of best fit.
Correlation coefficient
What is it?
Correlation Coefficient: gives a quantitative measure of the strength of a linear correlation. In other words, the correlation coefficient indicates how closely the data points cluster around the line of best fit.
Note:
The correlation coefficient always has values in the range from -1 to 1.
Note:
The correlation coefficient always has values in the range from -1 to 1.