STAT 22500 Lecture Notes - Lecture 5: Central Tendency, Standard Deviation, Interquartile Range
31 May 2019
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Document Summary
Measure of a central tendency is a measure of average or typical value. Three most common measures of central tendency is mean, median, mode. Sample mean-when most people use the word average, they are talking about the mean. Characteristics is sensitive to extreme scores is not necessarily a possible outcome. An applied example of the mean not being used when extreme values are present is income. If n is odd, median is the middle score. If n is even, median us the mean if the two middle scores. Exactly half of the data is below and exactly half is the data is above. If extreme scores exist in a data set the median is a better measure of central tendency. If extreme scores are unlikely the mean varies less from sample to sample than the median and is a better measure of center.
