On each of the these methods listed, give examples and solve problems on each 1. Product moment correlation 2. Spearman correlation 3. Raw score method 4. Kendel coefficient on concordan

here are examples and solved problems for each method:

1. Product Moment Correlation (Pearson's $r$)
   • Explanation: Pearson's Product-Moment Correlation Coefficient ($r$) measures the strength and direction of a linear relationship between two quantitative variables. Its value ranges from $-1$ to $+1$, where $+1$ indicates a perfect positive linear relationship, $-1$ indicates a perfect negative linear relationship, and 0 indicates no linear relationship.
   • Formula: $$$$