Texas Instruments TI-84 PLUS SILV Guidebook - Page 213

system displays the revised parameter value in the symbolic expression Y=mX+B, and refreshes the graph with the updated Manual-Fit Line. Select y 5 to finish the Manual Fit function. The calculator stores the current mX+b expression into Y1 and makes that function active for graphing. You can also select Manual-Fit while on the Home screen. You can then enter a different Y-Var such as Y4 and then press Í. This takes you to the Graph screen and then pastes the Manual-Fit equation in the specified Y-Var. In this example, Y4. Statistical Variables The statistical variables are calculated and stored as indicated below. To access these variables for use in expressions, press , and select 5:Statistics. Then select the VARS menu shown in the column below under VARS menu. If you edit a list or change the type of analysis, all statistical variables are cleared. Variables mean of x values sum of x values sum of x2 values sample standard deviation of x population standard deviation of x number of data points mean of y values sum of y values sum of y2 values sample standard deviation of y population standard deviation of y sum of x ... y minimum of x values maximum of x values minimum of y values maximum of y values 1st quartile median 3rd quartile regression/fit coefficients polynomial, Logistic, and SinReg coefficients 1-Var Stats v Gx Gx2 Sx sx n minX maxX Q1 Med Q3 2-Var Stats v Gx Gx2 Sx sx n w Gy Gy2 Sy sy Gxy minX maxX minY maxY Other a, b a, b, c, d, e VARS menu XY G G XY XY XY XY G G XY XY G XY XY XY XY PTS PTS PTS EQ EQ Chapter 12: Statistics 206