## How do you make a plus or minus sign?

Plus or Minus Symbol [±] Quick Guide For Windows users, simply press down the Alt key and type 0177 using the numeric keypad, then let go of the Alt key. These Plus or Minus sign shortcuts can work on any software including MS Word, Excel, and PowerPoint, on both Windows and Mac.

### How do you type subscripts in WebAssign?

Typing an alphabetic character or a space ends a subscript or superscript. For example, type H_2O to display H 2O, or Na^+ + Cl^- to display Na + + Cl -. To type advanced notation such as general formulas and equilibrium equations, enclose the content of a superscript or subscript in braces {}.

To enter a subscript while typing a variable name, touch and hold , and then slide to select .

**How do I put files on my TI Nspire?**

In the TI-Nspire” software, open the Documents Workspace. In the Documents Toolbox, click to open the Content Explorer. Navigate to the folder that contains the file you want to transfer. To transfer a file from a handheld to the computer, click the file, and then drag the file to a folder in the Computer panel.

**What can a TI Nspire CX do?**

This ability to enter and view equations and expressions on screen as they appear in textbooks is especially useful for step-by-step, arithmetic, algebraic, and calculus calculations. Use the TI-Nspire” Touchpad as you would a laptop touchpad.

## How do you do a scatter plot on a TI-NSpire CX?

Using the Nav Pad, arrow to the bottom of the screen and choose the x-variable to be “fat”. Then move to the left side of the screen and choose the y-variable to be “cal”. You will now see your scatter plot.

### How do you clear a graph on a TI-NSpire CX?

Press ~ > Clear Scratchpad (~ B). Press · to delete the Scratchpad contents.

To graph a function, press [MENU]’Analyze’Plot Function. Enter the function at the prompt, and press [ENTER] to view the graph.

**How do you do linear regression on a TI NSpire CX?**

**How do you make a table on the TI NSpire CX CAS?**

You also can add a table by using the shortcut:

## How do you graph residuals on TI NSpire?

The TI-NSpire provides an easier method for generating a residual plot. Use the touch pad to return to your fitted scatterplot (1.2). Press b and select 4: Analyze followed by 7: Residuals. Choose option 2: Show Residual Plot.

### How do you find the residual value?

Residual value equals the estimated salvage value minus the cost of disposing of the asset.

A residual value is a measure of how much a regression line vertically misses a data point. A residual plot is typically used to find problems with regression. Some data sets are not good candidates for regression, including: Heteroscedastic data (points at widely varying distances from the line).

**What does a positive residual mean?**

If you have a positive value for residual, it means the actual value was MORE than the predicted value. The person actually did better than you predicted. Under the line, you OVER-predicted, so you have a negative residual. Above the line, you UNDER-predicted, so you have a positive residual.

**What is a good r-squared?**

R-squared should accurately reflect the percentage of the dependent variable variation that the linear model explains. Your R2 should not be any higher or lower than this value. However, if you analyze a physical process and have very good measurements, you might expect R-squared values over 90%.

## How do you calculate r squared by hand?

To calculate the total variance, you would subtract the average actual value from each of the actual values, square the results and sum them. From there, divide the first sum of errors (explained variance) by the second sum (total variance), subtract the result from one, and you have the R-squared.

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