##### find SD for a data set

label Statistics
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Find sd.

The differences between two sets of dependent data are 21, 21, 15, 18, 15. Round to the nearest tenth.
Jul 29th, 2015

1. Square each of the differences from the previous step and make a list of the squares.

You need to square each of the numbers

Your list of squares is 441,441,225,324,225

2. Add the squares from the previous step together =1656

3. Subtract one from the number of data values you started with.

One less than this is 5-1 = 4.

4. Divide the sum from step four by the number from the previous step.

The sum was 1656, and the number from the previous step was 4. You divide these two numbers 1656/4 =41 4.

5. Take the square root of the number from the previous step. This is the standard deviation. standard deviation is the square root of 414, which is 20.34698 to the nearest tenth is 20.3.

Jul 29th, 2015

I am still confused bc I got a larger number too but these are my options. Did I miss a step? 3.06.0, 2.43.9

Jul 29th, 2015

yes it means that you missed a step,because the value you gave as differences already implies that you have subtracted the values from the mean which is the first step in calculating the sd....then the other steps follow systematically

Jul 29th, 2015

OK that is the problem as written and the answers so I will try and figure it out.

Jul 29th, 2015

Ok....thank you

Jul 29th, 2015

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Jul 29th, 2015
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Jul 29th, 2015
Oct 16th, 2017
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