Population Standard Deviation

Population Standard Deviation(little sigma x)- the measure of variability within a data set.
Range-also a measure of variability(the highest subtract the lowest)

We can find this number with our calculators. Go into STAT, edit, and edit a list. Once done that, go to STAT, CALC, 1-Var Stats, then select the list you edited.
It can also be done on the spreadsheet we made, found in my math folder.

Standard Deciation measures how varied the data is, relative to itself(how spread out the numbers are) The formula is too hard to type out, but is "the square root of the quotient between the sum of all x subtract x bar squared, divided by n"