Press STAT, EDIT is highlighted , 1[Edit] Values go in one column, frequencies in another- enter the number you see it at the bottom of the screen , press down-arrow, enter the next, etc.
It is easiest to enter the values x's first and then the frequencies. Frequencies must be whole numbers not decimals or fractions. If you are entering data from a grouped data table or histogram use the class midpoint for value, class frequency as frequency. You need to remember which column holds values and which column holds frequencies. Press STAT, EDIT is highlighted , 1[Edit] Values go in pairs : x values values of the predictor in one column, y-values values of the response in another it's easiest to enter all x-values down the column, then y-values down their column, next to corresponding x-values [For paired-data: values from one group in one column, values from the second group - in maching order - in another] You will need to remember which column holds x-values and which holds y-values.
Press Enter again. Press STAT, highlight CALC, press 2[2-Var Stats] 2nd-number of the x-column , [a comma - key is above the numbers], 2nd-number of the y-column You to see a screen giving mean of data in x-list x-bar , sum of x-list data sum of x's sum of x-squared not "sum of squares" SS x sample standard deviation for x-list Sx , then same data for y-list called y on screen and the sum of the xy's.
The TI will produce six different types of plots, and up to three different plots can be defined [each can be turned on or off once it is defined]. Plots are defined using the "Statplots" options. The information shown with this list shows: whether the plot is turned On or Off [is displayed on the graphing screen or not], the type of plot [shown with a symbol] the column [or columns] used for data and the graphing symbol box, plus sign or point. For the plot you are defining, you select several options either by highlighting the choice or by typing your choice.
Cursor down to select type. Step 2: Compute the statistics. Step 3: Find the variance. Made a a dozen or so small edits for clarity. Formatted math variable names and names of variables seen on TI screens.
Intervening changes suppressed. Because this article helps you, please click to donate! Because this article helps you, please donate at BrownMath. Enter the x values. Specify which statistics list contains the data set. Show your work : write down 1-VarStats and the list name. Assuming you used L1 , enter [ 2nd 1 makes L1 ]. Square it. Enter the class marks in L1. The class mark is the midpoint of each class.
Enter the class marks. Enter the frequencies. Specify which statistics lists contain the data set and the frequencies, in that order.
Show your work : write down 1-VarStats and both lists. Important: You must supply both lists. Always check the sample size n in the output, to guard against forgetting to enter the second list. If you see n is the number of classes instead of the number of data points, redo your 1-VarStats and this time specify both lists.
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