A test is biased when one group's scores are predictably different compared to the results from other test takers.

• A. When one group's scores are predictably different compared to the results from the other test takers
• B. When one group's test scores are higher than the rest of the test takers'
• C. When test takers are allowed to use books and notes to complete the test
• D. When all test takers score below or above average

Answer: (A)

At its heart, bias in testing means the assessment measures something differently for one group than for others in a way that isn’t explained by true differences in ability or preparation. If one group consistently scores higher or lower than the rest in a predictable pattern, that suggests the test is not equally fair to everyone and may be measuring something outside the intended construct. That’s why the statement is correct: there’s a systematic, group-based difference in scores that points to potential unfairness in how the test functions for that group.

The other ideas don’t define bias. Simply having higher scores for one group doesn’t prove unfair measurement unless it can’t be explained by actual ability or opportunity. Allowing books and notes changes test conditions rather than the fairness of what the test measures. And if everyone scores similarly—below or above average—that reflects overall difficulty or norms, not differential fairness across groups.