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CH 3: Describing Data
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Terms in this set (7)
sample mean
the sum of all the observations in a sample divided by n, the number of observations
standard deviation
measure of the spread of a distribution. It indicates just how different measurements typically are form the mean. calculated from variance
represented by s and the sample variance is s^2
sum of squares
sigma (Yi - Ybar)^2
variance
Sum of squares / n-1
coefficient of variation
the standard deviation expressed as a percentage of the mean
CV = 100% s/Ybar
median
middle measurement of a set of observations
mean vs median
they measure different aspects of the location of a distribution. The median is the middle value of the data, whereas the mean its center of gravity
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