once
twice (to EQ)
* Y=15 gives value of y variable when x variable is 526.
* The point (X, Y) is on the regression line where X = 541.33191 and Y=26.16118.
| Steps | Key Sequence | Screens |
| 1. Enter independent data into list, L1 | ||
| 2. Enter dependent data into list, L2 | ||
| 3. Set up Stats Plotter for scatter plot AND plot the data | ||
| 4. Set up the calculation for the regression equation | Press STAT | |
| once |
|
|
| 4 [for LinReg(ax+b)] | |
|
| NOTE: The other regression equations (i.e., exponential - ExpReg and quadratic - QuadReg) are determined in the same manner. | ||
| press 2nd then 1 (for L1) | |
|
| comma | |
|
| press 2nd then 2 (for L2) | |
|
| 5. Calculate the regression equation | ENTER | |
| 6. Store the equation so it can be graphed | press Y= and scroll to a location which is blank | |
| Press VARS | |
|
| 5 (for Statistics...) | |
|
| twice (to EQ) |
|
|
| 1 (to choose RegEQ) | |
|
| 7. Graph | press GRAPH | |
| Steps | Key Sequence | Screens |
| 8. Find the details | TRACE and use left and right arrow keys | |
| * P1:L1,L2 means this is Plot1 (scatterplot) with x–values (independent variable) in L1
and y–values (dependent variable) in L2 * Y=15 gives value of y variable when x variable is 526. |
||
| TRACE and use up arrow keys to trace line | |
|
| * Y1 means the regression line is being traced * The point (X, Y) is on the regression line where X = 541.33191 and Y=26.16118. |
||
| NOTE: To make predictions on the basis of your regression line, use the TRACE function and manually type in the appropriate x–value – the y–value will appear on the bottom right of your screen. If there is an error, then ZOOM Out and try again. | ||