Step 1: Turn on the STAT PLOT; press 2nd, Y=, ENTER, ENTER. Step 2: Clear the functions; press Y= then, CLEAR for each function that needs deleting. Step 3: Select values for the viewing window; press WINDOW. Step 4: Go to the lists; press STAT, ENTER. Step 5: Clear the lists; press the up arrow until the column heading is highlighted then, CLEAR, ENTER. Repeat for all columns that have unneeded data. Step 6: Enter the data. (L1 = Price per box; L2 = Boxes sold.) Step 7: View the data; press GRAPH. Step 8: Choose the regression model; press STAT, right arrow. Step 9: Select the cubic regression; press 6. Step 10: Place the cubic regression into the function area; press VARS, right arrow, ENTER, ENTER, ENTER. Step 11: View the scatter plot and regression model; press GRAPH. In standard form, the cubic regression, rounded to the nearest whole number, is as follows: y = −20035x3 + 184857x2 − 577955x + 637905 |
Page