To compare one person’s test scores to the scores of all other people who took the test, psychologists must know something about the test’s?

projective nature
subjective nature
length
norms

My -- you have a lot of aliases! Are you sindy, tanya, sandy, kelly, christina, anya -- or none of the above?

This answer is obvious if you've read your material and understand the four choices. We'll be glad to check YOUR answer.

http://www.answers.com/normative

To compare one person's test scores to the scores of all other people who took the test, psychologists must know something about the test's norm. Norms are a reference point that provides information about the average or typical performance of a specific group of people who have taken the test. Norms can be established through a large-scale study where a representative sample of individuals takes the test, and their scores are analyzed to determine the average performance, as well as the distribution of scores across the sample.

Knowing the norms of a test is crucial because it allows psychologists to compare an individual's performance to that of a larger group. For example, suppose an individual scores 80 out of 100 on a standardized test. Without knowledge of the test's norms, it is challenging to interpret the score accurately. But if the norms indicate that the average score on the test is 70, it becomes clear that the individual performed above average.

By incorporating norms, psychologists can make meaningful comparisons between individuals and make informed judgments about their performance on the test. Norms provide a frame of reference for understanding how a person's performance compares to others who have taken the same test.