Figure 1. Descriptive error bars. Means with error
bars for three cases: n = 3, n = 10, and n =
30. The small black dots are data points, and the
column denotes the data mean M. The bars on
the left of each column show range, and the bars
on the right show standard deviation (SD). M and
SD are the same for every case, but notice how
much the range increases with n. Note also that
although the range error bars encompass all of
the experimental results, they do not necessarily
cover all the results that could possibly occur. SD
error bars include about two thirds of the sample,
and 2 x SD error bars would encompass roughly
95% of the sample
Figure 1. Descriptive error bars. Means with errorbars for three cases: n = 3, n = 10, and n =30. The small black dots are data points, and thecolumn denotes the data mean M. The bars onthe left of each column show range, and the barson the right show standard deviation (SD). M andSD are the same for every case, but notice howmuch the range increases with n. Note also thatalthough the range error bars encompass all ofthe experimental results, they do not necessarilycover all the results that could possibly occur. SDerror bars include about two thirds of the sample,and 2 x SD error bars would encompass roughly95% of the sample
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