calculations Statistical on non-graphing calculators
Many calculators can compute one-variable statistics (mean, standard deviation) for a set of data. Some can also calculate two-variable statistics (Pearson's correlation, least squares line) for a set of data with two variables. Here are some common notations used on these calculators; there may be others. Consult your calculator's manual for more explicit instructions and examples. One variable: sample mean: x sample standard deviation: s, sx , , x , n-1 , x n-1 Note: n and x n denote something different -- the standard deviation with n in the denominator rather than n-1. On some calculators, the two different versions are denoted by s and , in which case you want s (see your calculator's manual if you're confused!) Two variables (x and y): sample mean of x's: x sample standard deviation of x's: sx , x , x n-1 sample mean of y's: y sample standard deviation of y's: s y , y , y n-1 Pearson's correlation: r, COR intercept of least-squares line: a, A, ITC slope of least-squares line: b, B, SLP, SLOPE $ predicted y for an x: y , y value of x which yields a given predicted value of y: x The first step is to enter data. Most non-graphing calculators have a key with a " + " on it for this purpose. Some calculators require you to get into "STAT" mode before you can enter data. If a calculator does both one- and two-variable statistics, it might have a "STAT 1" mode and a "STAT 2" mode, depending on whether you're entering one variable or two variable data. One-variable statistics: Clear the calculator and get into "STAT" or "STAT mode 1" if your calculator has it. Type in the first data value, then hit the " + " key; a "1" or "n = 1" should appear. If a bigger number appears, you might not have cleared the calculator before you started and you need to do that before entering data. Type in the second number, hit " + "; a "2" or "n = 2" should appear. Keep going until all the data values have been entered. Then press x to get the mean and the standard deviation key to get that (see above for possible labels for standard deviation). Two-variable statistics: Clear the calculator and get into "STAT" or "STAT 2" mode if your calculator has it. The difference in entering two variable data is that you have to enter both the x and y value for an individual before you hit " + ". Type the x value for the first data pair. There should be a key like " x y ". Hit this key and then enter the y value for the fi...