# Calculator Notes for the TI-Nspire and TI-Nspire CAS

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1 CHAPTER 11 Calculator Notes for the Note 11A: Entering e In any application, press u to display the value e. Press. after you press u to display the value of e without an exponent. Note 11B: Normal Graphs You can graph normal curves in the Data & Statistics application and the Graphs & Geometry application. 1. To graph a normal curve in the Data & Statistics application, first open a Lists & Spreadsheet page. Give columns A and B variable names such as value, and density. You do not need any data in the columns. Press b and choose Data & Statistics. Plot value on the x-axis and density on the y-axis. Press b and choose Analyze Plot Function. Type normpdf ( x,, ) and press. Set an appropriate viewing window. It is helpful to choose values for x-minimum and x-maximum that are about four standard deviations below and above the mean. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 11 75

2 Note 11B: Normal Graphs 2. In the Graphs & Geometry application, you can graph a normal curve with the normal probability function, normpdf(. To graph a normal distribution with mean,, and standard deviation,, type normpdf(x,, ) in the function line. For example, to graph the normal distribution with mean 3.1 and standard deviation 0.28, type normpdf(x, 3.1, 0.28) in the entry line. Set an appropriate window. To graph the standard normal distribution, that is, a normal curve with mean 0 and standard deviation 1, type normpdf(x). Note 11C: Probabilities of Normal Distributions Calculating Ranges You can calculate the area under the normal curve between two endpoints in the Calculator application using the normal cumulative distribution function, normcdf(. To access this command, press b and choose Statistics Distributions Normal Cdf, and input values into the Normal Cdf dialog box, or type normcdf(lower, upper), and press. For any normal distribution, with mean and standard deviation, enter the command in the form normcdf(lower, upper,, ). 76 CHAPTER 11 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

3 Note 11C: Probabilities of Normal Distributions Graphing Ranges Use the Data & Statistics application or the Graphs & Geometry application to calculate the probability associated with an area under the normal curve. To calculate the area under the normal curve in the Data & Statistics application: a. Graph the normal curve. See Note 11B for help graphing the normal curve using the Data & Statistics application. b. Press d and choose Analyze Plot Value. At the prompt, type the lower bound for the area you want to find and then press. c. Repeat the previous step to add the upper bound. d. Press b and choose Analyze Shade Under Function. Move the cursor over the lower bound until a pointing finger appears and press a. Then move the cursor to the upper bound until a pointing finger appears and press a. This will calculate the area between the values and under the curve. To clear the displayed values, move the cursor to a blank area of the screen and press a. To display the area value again, move the cursor over the shaded area and press a. You can also use the Shade Under tool to calculate the area under the normal curve, but the area calculated will be less precise. a. Press b and choose Analyze Shade Under Function. Move the dashed line to the lower bound of the area you want the handheld to find and press a. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 11 77

4 Note 11C: Probabilities of Normal Distributions b. Move the dashed line to the upper bound and press a. To change the area boundaries, move the cursor over a boundary line, press /a, and move the line to a new location. The area calculation changes as the line moves. Press a when the boundary is where you want to leave it. To calculate the area under the normal curve in the Graphs & Geometry application: a. Graph the normal distribution. For help graphing the standard normal curve, see Note 11B. Hide the entry line by pressing /G. b. Create two points on the graph by pressing b and choosing Points & Lines Point On. Then click on two different locations on the graph. Press d to put away the Point On tool. c. Double-click the x-value of the left point, type in the initial value from which you want to find the area under the normal curve, and press. 78 CHAPTER 11 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

5 Note 11C: Probabilities of Normal Distributions d. Press b, choose Construction Measurement Transfer, and click on the x-coordinate of the left point. Move the cursor to the x-axis, and press a. Press d to put away the Measurement tool. e. To change the value of the right point to the appropriate value, repeat the previous two steps. f. Press b, choose Measurement Integral, move to and click on each of the following: the normal distribution graph, the initial value on the x-axis, and the final value on the x-axis. The area under the curve will be shaded and a numerical value representing the area will be displayed. Press d to put away the tool. Note 11D: Creating Random Probability Distributions You can simulate a random probability distribution in the Calculator application or the Lists & Spreadsheet application. You can view the distribution as a histogram in the Data & Statistics application. a. To create a uniform distribution, use the rand( command. This example creates a list of 500 values uniformly distributed between 20 and 50. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 11 79

6 Note 11D: Creating Random Probability Distributions b. To create a normal distribution, use the randnorm( command. This example creates a list of 500 values with mean 35 and standard deviation 5. Almost all of the values will be between 20 and 50. c. To create a left-skewed distribution, use the cube root of rand(. This example creates a left-skewed population of 200 values between 20 and 50. d. To create a right-skewed distribution, use the cube of rand(. This example creates a right-skewed population of 200 values between 20 and 50. Note 11E: Correlation Coefficient There are several ways to find a correlation coefficient, r, using the handheld. You can manually enter the calculations yourself, or you can have the handheld do the work for you. Computing r Using Two-Variable Statistics You can manually calculate r using the formula r ( x x _ )(y y _ ). s x s y (n 1) To calculate r using a Two-Variable Statistics dialog box: a. Use the Lists & Spreadsheet application to enter and store the bivariate data in two named lists. 80 CHAPTER 11 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

7 Note 11E: Correlation Coefficient b. Press b and choose Statistics Stat Calculations Two-Variable Statistics. c. Choose the appropriate variables for X List and Y List. Make sure the 1st Result Column box is c[ ]. Then press. d. A list of two-variable statistics will appear in column C. Their corresponding values are in column D. The correlation coefficient, r, is displayed in cell D14. You can use the Calculator application to find the correlation coefficient by following the previous steps in a Calculator page. The two-variable statistics will appear on the screen. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 11 81

8 Note 11E: Correlation Coefficient Computing r Using Linear Regression In the Calculator application or the Lists & Spreadsheet application, you can calculate the correlation coefficient, r, using linear regression. In the Calculator application, enter and store two lists of the same length. Then press b and choose Statistics Stat Calculations Linear Regression (a+bx). Select the appropriate variables for X List and Y List, and press. The correlation value, r, will be displayed with other information. In the Lists & Spreadsheet application, enter lists of equal length into two columns. Press b and choose Statistics Stat Calculations Linear Regression (a+bx). Select the appropriate variables for X List, Y List, and the column where you want to store the results, and press. The correlation value, r, will be displayed with the other information. Note 11F: Least Squares Line You can find the equation of the least squares line in either the form y mx b or the form y a bx. If you have two lists defined, you can find the equation of the least squares line in several ways. Least Squares Line in the Data & Statistics Application When you create a scatter plot in the Data & Statistics application, you can graph a least squares regression line. Press b and choose Analyze Regression Show Linear (mx+b) or Show Linear (a+bx). 82 CHAPTER 11 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

9 Note 11F: Least Squares Line Least Squares Line in the Calculator and List & Spreadsheet Applications An equation of the least squares regression line can be computed in the Calculator application or the Lists & Spreadsheet application. In either application, press b, choose Statistics Stat Calculations Linear Regression (mx+b) or Linear Regression (a+bx), and choose the appropriate variables for X List and Y List. In Save RegEqn to: choose the name you want to give the equation of the regression line. The a and b values are stored as variables, and the equation is stored in the function you selected. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 11 83

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