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Multiple choice question on identifying statistic

Suppose a researcher has trained observers to rank participants according to their level of frustration when trying to solve a puzzle. What statistic should be used to determine the extent to which the observers agree in their rankings of frustration?
a. The measure of central tendency
b. The Spearman correlation coefficient
c. The point-biserial correlation coefficient
c. The Pearson product-moment correlation coefficient

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Answer: b) The Spearman correlation coefficient

The measures of central tendency are mean, median and mode. In this case we are not calculating any one of these. So a) The measure of ...

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The solution identifies statistic that should be used to determine the extent to which the observers agree in their rankings of frustration.

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