Which of the following statistics is most important in the calculation of test validity and reliability?
A) Standard error of estimate
B) Coefficient of correlation
C) Median
D) Percentile
E) Standard deviation

Question

Quizplus · Accepted Answer

The coefficient of correlation is the most important statistic for calculating test validity and reliability. It measures the strength and direction of the relationship between two variables, such as test scores and actual performance. A high coefficient of correlation indicates that the test is measuring what it is supposed to measure, and that the scores are reliable over time. Other statistics, such as standard deviation and percentile rank, may be useful for interpreting test scores, but they do not directly measure validity or reliability.

Which of the Following Statistics Is Most Important in the Calculation