The Effect Of Measuring Device Measures On Students From Texas A & M Psychology Class

962 Words Aug 9th, 2014 4 Pages
Introduction Our report focused on students from Texas A&M Psychology class where each was asked to rate their self-esteem level. We have looked at two terms; reliability and validity which were used in the Rosenberg Self- Esteem Scale to help assess individuals’ self-esteem. According to the book Essentials of Statistics of Behavioral Science by authors Frederick J. Gravetter and Larry B. Wallnau (2014) they define reliability as how consistent a study or measuring device is. A measurement is said to be reliable or consistent if the measurement can produce similar results if used again in similar circumstances. Along with that they define validity as an indication of whether the measuring device measures what it claims to. An example of a measure being reliable but not valid is if the scale is reliable it tells you the same weight every time you step on it as long as your weight has not actually changed. However, if the scale is not working properly, this number may not be your actual weight. If that is the case, this is an example of a scale that is reliable, or consistent, but not valid.
Reliability and validity are both very important criteria for analyzing the quality of measures. A measurement procedure cannot be valid unless it’s reliable however, a measurement can be reliable without being valid (someone could measure your height and say they are measuring intelligence, they would get a consistent and reliable result each time but this would not be valid since…
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