In a simple linear regression equation y = ax + b the "a" is the 1

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In a simple linear regression equation y = ax + b the "a" is the 1. Slope,  2. Regression line,   3. y intercept

A 1 only

B 1 and 2 only

C 3 only

D 1,2 and 3

Which of the following statements is MOST correct?

A If"r" is greater than "1", there is a positive correlation

B If "r" is less than one, there is a negative correlation

C If "r" is less than one, but greater than 0, there is a positive correlation

D If "r" is a negative number, there is a negative correlation