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Basic correlation important topic in statistics it will be very useful
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Correlatio n A measure of the strength of association among the between variables Meaning of correlation: Correlation is defined as Relationship between two or more variables. Co – Together ; Relation – Connection Definition: “The degree of association between two variables” “A measure of the strength of association among and between variables” Example:
Scatter Diagram is referred to as a plot or a mathematical diagram. The Scatter diagram graphs pairs of numerical data, with one variable on each axis, to look for a relationship between them. If the variables are correlated, the points will fall along a line or curve. Merits of Scatter Diagram Limitations of Scatter Diagram When to use Scatter diagram It shows the relationship between two variables It is the best method to show you a non- linear pattern The range of data flow i.e., maximum and minimum values can be easily determined Observation and reading is straightforward. Plotting the diagram is relatively simple. Scatter diagrams are unable to give you the exact extent of correlation. Scatter diagram, does not show you the quantitative measure of the relationship between the variables. It only shows the quantitative expression of the quantitative change. This chart does not show you the two variables. When you have paired numerical data. When your dependent variable may have multiple values for each value of your independent variable. When trying to determine whether the two variables are related, such as,
How do we use Scatter Diagram?