AP PSYCHOLOGY

Detailed explanation-1: -For example, if your scale is off by 5 lbs, it reads your weight every day with an excess of 5lbs. The scale is reliable because it consistently reports the same weight every day, but it is not valid because it adds 5lbs to your true weight. It is not a valid measure of your weight.

Detailed explanation-2: -Validity refers to what characteristic the test measures and how well the test measures that characteristic. Validity tells you if the characteristic being measured by a test is related to job qualifications and requirements. Validity gives meaning to the test scores.

Detailed explanation-3: -A simple example of validity and reliability is an alarm clock that rings at 7:00 each morning, but is set for 6:30. It is very reliable (it consistently rings the same time each day), but is not valid (it is not ringing at the desired time).