anyone have a TI-83 plus calculator and know what the symbols mean for after you enter in 1 or 2 lists of data and do the 2-Var STats thing? i know xbar is the mean of the x values, Ex is the # of data points, but what is Sx (standard deviation?), and thise little circle thing and then an x (is that standard error?)
thanks
2007-01-18 09:52:23 · 2 answers · asked by pickle_erij 1 in Science & Mathematics ➔ Mathematics
Ex is the sum of all of the data points
n is the number of points
Sx is standard deviation, accouts for error and is used in a sample
ox is a different standard deviation, used for an entire population
2007-01-18 10:08:12 · answer #1 · answered by hmc12rocks 2 · 0⤊ 0⤋
Actually, Ex is the sum of all x's, and unfortunately they have reversed the sample std dev and the population std dev, so Sx = population std dev and sigma x (that little circle thing is the greek letter sigma) is the sample std deviation- one uses n and the other uses n-1 as the # of samples tested
2007-01-18 18:06:48 · answer #2 · answered by lynn y 3 · 0⤊ 0⤋