For a given set of twelve ranked data values, the sum of the squared differences is 63.18. What is Spearman's coefficient of rank correlation for the data?
A) +.7791
B) -.7791
C) +.2209
D) -.2209

Question

Quizplus · Accepted Answer

Spearman's rank correlation coefficient is calculated using the formula: 1 - (6 * Σd²) / (n(n² - 1)), where Σd² is the sum of squared rank differences and n is the number of data points. For n = 12 and Σd² = 63.18, the calculation gives approximately +0.7791.

For a Given Set of Twelve Ranked Data Values, the Sum