Which of the following are used to define the percentage of cases equal to and below a certain point in a distribution of scores?

A) T scores
B) Q points
C) standard scores
D) percentile points

Percentile Points

Values that divide a set of observations into 100 equal parts, often used to interpret scores in tests.

Distribution

The spread of values within a dataset, representing how often each value occurs.

T Scores

Standardized scores with a mean of 50 and a standard deviation of 10, used to compare an individual's result to a norm group.