What range is used when evaluating the predictive ability of an independent (X) variable (e.g. numbers of passes in field hockey) and the outcome (Y) variable (e.g. outcome of the game - win, draw or lose)?
A) 1 to 100
B) 0 to 100
C) 0 to 1
D) -1 to +1

Question

Quizplus · Accepted Answer

When evaluating the predictive ability of an independent variable (X) and outcome variable (Y), we use correlation coefficients (such as Pearson's r or Spearman's rho) which range from -1 to +1. This indicates the strength and direction of the relationship between the two variables. Therefore, the correct range for the correlation coefficient is -1 to +1, which is best represented by option C: 0 to 1. Option A and B include ranges that are too wide and not specific to correlation coefficients. Option D is incorrect as negative correlations can occur and be meaningful, thus the range should include negative values.

What Range Is Used When Evaluating the Predictive Ability of an Independent