Indicate whether or not the following statements regarding the correlation coeff
ID: 3397663 • Letter: I
Question
Indicate whether or not the following statements regarding the correlation coefficient r are true or false:
F/T An r value of +0.65 offers stronger proof of cause and effect than does an r value of -0.50.
F/T An r=0.0 implies there is absolutely no mathemtical correlation between two variables.
F/T An r value > 0.0 implies that Y increases as X decreases.
F/T An r value > 0.0 always indicates significant correlation.
F/T When comparing correlation between two variables, use averages rather than individual values.
F/T If r > 0.5, it is permissible to extrapolate values of Y for values of X that are not in the data range of X.
F/T Only positive values of r provide evidence of cause and effect.
Explanation / Answer
True.
It doesnot matter whether r is positive or negative. The positive and negative sign indicate possitive correlation and neagtive correlation respectively.
True.
False
Negative correlation implies that Y increases as X decreases or that X increases as Y decreases.
False
r > 0 indicate positive correlation.
True
True
False