![]() ![]() Its degree of reliability has to do instead with the predictability of its relationship with whatever is being tested. The common ways for demonstrating the questionnaire reliability are the Cronbach’s statistic, item-total correlation, and test-retest reliability. ![]() It might always register three degrees too high, for example. Note, however, that the thermometer does not have to be accurate in order to be reliable. ![]() A thermometer that lacks reliability would change even when the temperature does not. If the test has adequate reliability, however, then a validation study would. If the temperature in a room stays the same, a reliable thermometer will always give the same reading. Therefore, it is desirable to use tests with good measures of reliability. Imagine that you’re trying to assess the reliability of a thermometer in your home. Four methods sociologists can use to assess reliability are the test-retest procedure, the alternate forms procedure, the split-halves procedure, and the internal consistency procedure.Good measurement instruments should have both high reliability and high accuracy.If a measurement instrument provides similar results each time it is used (assuming that whatever is being measured stays the same over time), it is said to have high reliability. The test-retest reliability measurement or repeatability is a method for testing the stability and reliability of an assessment instrument over time. ![]()
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