Find the standard deviation for the following set of data: 12.5, 12.7, 14.9, 11.3, 11.7, 10.9
A. 3.2
B. 1.65
C. 1.31
D. 3.36
Find the variance for the following set of data: 12.5, 12.7, 14.9, 11.3, 11.7, 10.9
A. 10.27
B. 1.71
C. 2.71
D. 11.27
A. 3.2
B. 1.65
C. 1.31
D. 3.36
Find the variance for the following set of data: 12.5, 12.7, 14.9, 11.3, 11.7, 10.9
A. 10.27
B. 1.71
C. 2.71
D. 11.27
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For the first set of data, C, or 1.31 is the standard deviation. It follows that the variance is B, or 1.71.
You probably will just do this on your calculator, and definitely should on a test. Click on list, then edit, then enter in your data into list 1. Then exit out and go to list, then calc, then 1-var stats, and click enter. Standard deviation should be σx. Just square the standard deviation to get variance.
You can just do it by hand... you might want to remember how to do it by hand since the test might ask you your procedure. First find the mean, then find the difference between each score and the mean. Square it and sum all the squared values (differences) found. Divide this by the number of data values minus one, and then take the square root to get standard deviation. The formula is simple so it should be fairly intuitive, too, though.
You probably will just do this on your calculator, and definitely should on a test. Click on list, then edit, then enter in your data into list 1. Then exit out and go to list, then calc, then 1-var stats, and click enter. Standard deviation should be σx. Just square the standard deviation to get variance.
You can just do it by hand... you might want to remember how to do it by hand since the test might ask you your procedure. First find the mean, then find the difference between each score and the mean. Square it and sum all the squared values (differences) found. Divide this by the number of data values minus one, and then take the square root to get standard deviation. The formula is simple so it should be fairly intuitive, too, though.