How is the correlation coefficient r related to the least squares slope b Or= sy / bx Or= b sy / Sx Or = b sx / Sy Or = sx / b sy Correlation ranges from to What number indicates no linear correlation? R2 ranges from to Correlation measures: Null relationships. Any functional relationship. Linear relationships. Correlation and simple linear regression can be used when there is: Two dependent variables At least one numerical variable Two independent variables Two numerical variables