【正文】
population in a bellshaped pattern called the normal curve. Reliability A test is reliable when it yields consistent results. To establish reliability researchers establish different procedures: 1. Splithalf Reliability: Dividing the test into two equal halves and assessing how consistent the scores are. 2. Reliability using different tests: Using different forms of the test to measure consistency between them. 3. TestRetest Reliability: Using the same test on two occasions to measure consistency. Validity Reliability of a test does not ensure validity. Validity of a test refers to what the test is supposed to measure or predict. 1. Content Validity: Refers to the extent a test measures a particular behavior or trait. 2. Predictive Validity: Refers to the function of a test in predicting a particular behavior or trait.