### Calculator Set Up

- Make sure that your calculator has the Plots Off, Y= functions cleared, the MODE and FORMAT are set at “stage left”, and the lists are cleared.
- Turn the Diagnostics on.

- Press
**2**the^{nd}**CATALOG**(2^{nd}of 0). Press the teal**D**button (ALPHA of x^{-1}) This brings you to the items in the catalog that start with D. - Arrow down until you reach the command
**DiagnosticOn**and press**ENTER**. - Press
**ENTER**a second time. Later, when you perform a linear regression, you will see an “r” value. If that value is close to a ±1 there’s a strong correlation to the data, meaning the data points can be modeled by the line well.

### Enter the Data

Data for this activity will be stored in L1 and L2.

- Press the
**STAT**menu and choose option**1:Edit…** - Type the first value in the L1 table, then press
**ENTER**, type the second value next, and so forth. - Arrow over to the L2 table and enter the corresponding dependent values
- Make sure there is an equal amount of data in both L1 and L2 so you don’t get a “dim mismatch” error.

### Performing a Regression

- To view your data, you must set up a stat plot. Press
**2**(2^{nd}STAT PLOT^{nd}of Y=). Pressto set up Stat plot 1. Set up your stat plot to look like the one at the right. Then press the

ENTER**ZOOM**key and choose option**9:ZoomStat**. - To find an equation that matches the data you see, you need to perform a regression on the data. Press the
**STAT**menu and arrow to the right to the**CALC**menu. Choose the option that most closely represents the appearance of your data. For example, if your data looks linear, choose**4:LinReg (ax+b)**. Type**L1**, a**comma**,**L2**, then the**VARS**button, arrow over to**Y-VARS**, choose**1:Function**, the**1:Y**option, then press_{1}**ENTER**.

When you press the **GRAPH** button a line/curve that matches your data points will also be in your viewing window. Pressing the **Y=** button will give you the equation of that line/curve.

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