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Standard deviation can be calculated using several methods on the TI-83 Plus and TI-84 Plus Family. Standard deviation can be calculated by using the stdDev() function. The stdDev() function can be located by performing the following: 1) Press [2nd][LIST]. 2) Scroll to MATH and select 7:stdDev(.
Using the Calculator: To find the mean and standard deviation of a probability distribution, First: STAT > EDIT, then in L1 put in all the x values, and in L2 put in the probability for each x value.
Throughout this section the calculator will ask you to choose [Data] or [Stats]. • Use [Stats] when you just have the statistics about the data such as the mean and standard deviation.
To calculate mean, median, standard deviation, etc. Press STAT , then choose CALC , then choose 1-Var Stats . Press ENTER , then type the name of the list (for example, if your list is L3 then type 2 nd 3 ).
Sx - the sample standard deviation of your x data: = (xi! x ) " 2 n ! 1!x - the population standard deviation of your x data - = (xi! x ) " 2 n n - the number of data points you have y - the numerical mean (average) of y! y - the sum of your y data ! y2 - the sum of the squares of your y data ! xy - the sum of the products of your data
Mean and standard deviation for your variable will appear on the screen. Scroll down to view five number summary. Two variable statistics. To enter data, press STAT and go to 1:EDIT. In the first empty column, enter the data for variable 1. Move the cursor to column L2, and enter the second variable’s data in that column.
Press enter and the list will populate with the predicted values of y according to the equation of the line. Choose an empty list and above the horizontal line enter the equation for residuals (observed y – predicted y) using the appropriate list numbers (e.g., L2 – L3).
