STAT 2230 Lecture Notes - Lecture 6: Quartile, Nicotine, Statistical Model
27 Jan 2017
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Day 6: variability [jan 20] how variable is the data? reasons to estimate dispersion because variation is a central concept in biology to interpret measures of center. Measures of dispersion range: difference between the largest and smallest observation interquartile range (iqr): difference between the first and third quartile in the sample quartiles divide the data into 4 equal bins boxplot. Median and iqr can be visualized with a boxplot deviation difference between an observation and the sample mean variance (s 2 ) s 2 = n ( y i. Measured in the same units as your variable a typical distance from the mean the sample standard deviation: the sample standard deviation is denoted by s formula and is defined by a. Day 7: variability continued [jan 23] coefficient of variation (cv) standard deviation is expressed as a percentage of the mean.
