Q.1. Define correlation.
Solution
A.1. Correlation is a statistical measure that describes the extent to which two variables move in relation to each other. In other words, it's a way to measure how much one variable depends on another. It's expressed as a number between -1 and 1. If the correlation is close to 1, it means that there's a strong positive correlation between the two variables. When one variable goes up, the other one also goes up. A correlation close to -1 means there's a strong negative correlation, i.e., one variable goes up when the other goes down. A correlation near 0 means that there's no linear relationship between the variables.
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