How Could You Measure the Reliability of a New Test

Multiple Choice

How could you measure the reliability of a new test intended to measure nervousness?

A) Determine whether scores on the test form a normal distribution.
B) Determine whether scores on the test correlate with hand shaking and voice tremor.
C) Test people in two or more countries and see whether the results are similar.
D) Test people repeatedly and see whether they get about the same score each time.