Reliability Essay Example for Free

Reliability EssayThe most known and widely used types of reliability ar parallel forms, test-retest, interrater, and internal consistency reliability. Reliability is important because it gives precision, accuracy and dependable answers in researches. Consistency of measurement means there is a unquestionable measurement. If a method or particular piece of research is not reliable, researchers will and should lack confidence that the results obtained would be obtain again, and can thus scarce be confident that they reflect reality.Even though that several examples of research, which reach similar results, even if the research is not strictly replicable, may still service of process researchers to increase their confidence in reliability, and perhaps also guide them toward appreciating the range of applicability of a theory (Kurpius Stafford, 2006). Standard scores argon the scores that are comparable because they are standardized in units of standard deviation while percent ile or a percentile rank is a point in a distribution of scores below which a given percentage of scores fall.It is a particular point within an entire distribution of scores. centile ranks have one major disadvantage in comparison to standard scores percentile ranks have unequal units along their scale. Percentile ranks in the mettle of the distribution tend to overemphasize differences between standard scores, where as percentile ranks at the tails of the distribution tend to underemphasize difference performance. The measure of aboriginal tendency is a statistical technique wherein a single number is used to represent a group of numbers.Three different central tendency measures that are usually applied in researches are the mean, median and mode. These central tendency measures are significant because they have their own importance in measuring the central tendency. Mean provides the best estimate of average. However median is more reliable because it is clear and fixed on th e other hand, mode is used when a pronto and approximate measure of central tendency is required.