Which of the following are true about the correlation coefficient ???? ?

1.The correlation coefficient measures the strength of a linear relationship.

2. A correlation coefficient of 1.0 means an increase in one variable always means an increase in the other variable.

3. The correlation coefficient is the slope of the regression line in standard units.

4. The correlation coefficient stays the same if we invert our axes.

5. If we add a constant, C, to our original data, our correlation coefficient will increase by the same C.