I understand how to find standard deviation, but not Mean Absolute Deviation, can you help?
Mean absolute deviation.
Let's break it down into its components.
Mean - Average
Absolute - absolute value - sign doesn't matter - if negative, make positive
Deviation - difference from the mean
Let's do an example. Population 3 7 4 2. Total 16. Mean (Average) 16/4 = 4.
Deviations
3 - 4 = -1 absolute value 1
7 - 4 = 3
4 - 4 = 0
2 - 4 = -2 absolute value 2
Sum of these deviations 1 + 3 + 0 + 2 = 6
Mean (average) of these deviations is 6 / 4 = 1.5.
Good luck,
Paul
SOURCE: standard deviation
Enter the first number, 1.
Hit the σ+ (Sigma+) key. ( n=1 will appear in the window)
Enter the second number, 1.
Hit the σ+ (Sigma+) key. (n=2 will appear in the window)
. . . . .
Enter the last number, 7.
Hit the σ+ (Sigma+) key. (n=7 will appear in the window)
Hit 2nd x2 (by hitting the 2nd key you are actually selecting the x-bar written above the key.) This gives you the mean.
Hit 2nd sqrt(x). This gives you the sample standard deviation which we will use in class.
Make sure you turn your calculator off and on for new data sets.
SOURCE: how do I get mean and standard deviation of 32.4
You can calculate the mean by dividing the total 32.4 by the number of entries (6). That is all you can do. You need the actual numbers (data) to get the standard devistion.
SOURCE: standard deviation and mean are not correct
Just add the values and divide the sum by the number of values.
SOURCE: how to solve mean, variance
get the TI 84 for dummies book, and check the statistic functions - they are fantastic - got me an A in statistics - once you start using them, you must practice- a function for everything!!
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