Sharp EL9900C EL-9900C - Page 174

Chapter 10: Statistics & Regression Calculations Enter a data in a list table 1. Press S A E. 2. Enter the time into list 1 (L1). 3. Enter the temperature into list 2 (L2). Plotting the data 1. Press [ A E. 2. Press E to turn on the plotting. 3. Press } and ' to select XY of DATA menu and press E. Freq will change to ListY and set L2 to ListY. Selecting the graph type 1. Press } to move the cursor to GRAPH. 2. Press [ G and 2 (2 Scattr+) to set the graph type to scatter and point type to "+". 3. Press Z A 9 (9 Stat) to plot the scatter diagram for this data. • Selecting A 9 in the ZOOM mode allows for quick graphing in an optimum range since window setting values of the graph plotting screen are automatically set using the list data. Drawing a regression curve using quadratic regression 1. Press # C S D 0 4 (04 Rg_x2). 2. Press ( @ 1 , @ 2 , @ z A E A 1 ). If you enter Y1 as the last variable, the obtained formula will automatically be set to the formula Y1. 3. Press E. The regression formula and parameters will be displayed on the screen. 4. Press G. The calculator will draw the scatter diagram using the determined parameter values. 5. If there is a large difference between the regression curve and plotted dots, change the regression curve and repeat the above procedures. 164