User manual TEXAS INSTRUMENTS TI-84 PLUS

[. . . ] TI-84 Plus TI-84 Plus Silver Edition Guidebook Important Information Texas Instruments makes no warranty, either express or implied, including but not limited to any implied warranties of merchantability and fitness for a particular purpose, regarding any programs or book materials and makes such materials available solely on an "as-is" basis. In no event shall Texas Instruments be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials, and the sole and exclusive liability of Texas Instruments, regardless of the form of action, shall not exceed the purchase price of this product. Moreover, Texas Instruments shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party. 2005 Texas Instruments Incorporated Windows and Macintosh are trademarks of their respective owners. ii USA FCC Information Concerning Radio Frequency Interference This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. [. . . ] This displays a free-floating cursor at the center of the display screen Chapter 12: Statistics 313 2. Press the cursor navigation keys (} | ~ ) to move the cursor to the desired location. Press the cursor navigation keys (} | ~ ) to move the cursor to the second location. The current value of the first parameter (m) is highlighted in the symbolic expression. Modify parameter values Press the cursor navigation keys ( | ~ ) to move from the first parameter (m) or (b) the second parameter. When you edit the value of the selected parameter, the edit can include insert, delete, type over, or mathematical expression. The screen dynamically displays the revised parameter value. Press to complete the modification of the selected parameter, save the value, and refresh the displayed graph. The system displays the revised parameter value in the symbolic expression Y=mX+B, and refreshes the graph with the updated Manual-Fit Line. Chapter 12: Statistics 314 Select y 5 to finish the Manual Fit function. The calculator stores the current mX+b expression into Y1 and makes that function active for graphing. This takes you to the Graph screen and then pastes the ManualFit equation in the specified Y-Var. In this example, Y4. Statistical Variables The statistical variables are calculated and stored as indicated below. To access these variables for use in expressions, press , and select 5:Statistics. If you edit a list or change the type of analysis, all statistical variables are cleared. 1-Var Stats 2-Var Stats VARS menu XY Variables mean of x values sum of x values sum of x2 values sample standard deviation of x population standard deviation of x number of data points mean of y values sum of y values sum of y2 values sample standard deviation of y Other v Gx Gx2 Sx v Gx Gx2 Sx G G XY XY XY XY sx n sx n w Gy Gy2 Sy G G XY Chapter 12: Statistics 315 Variables population standard deviation of y sum of x . . . y minimum of x values maximum of x values minimum of y values maximum of y values 1st quartile median 3rd quartile regression/fit coefficients polynomial, Logistic, and SinReg coefficients correlation coefficient coefficient of determination regression equation summary points (Med-Med only) 1-Var Stats 2-Var Stats Other VARS menu XY sy Gxy minX maxX minX maxX minY maxY Q1 Med Q3 a, b a, b, c, d, e r r2 , R 2 RegEQ x1, y1, x2, y2, x3, y3 G XY XY XY XY PTS PTS PTS EQ EQ EQ EQ EQ PTS Q3 Q1 and Q3 The first quartile (Q1) is the median of points between minX and Med (median). The third quartile (Q3) is the median of points between Med and maxX. Chapter 12: Statistics 316 Statistical Analysis in a Program Entering Stat Data You can enter statistical data, calculate statistical results, and fit models to data from a program. You can enter statistical data into lists directly within the program (Chapter 11). Statistical Calculations To perform a statistical calculation from a program, follow these steps. On a blank line in the program editor, select the type of calculation from the STAT CALC menu. Enter a comma and then the name of a Y= variable, if you want to store the regression equation to a Y= variable. Chapter 12: Statistics 317 Statistical Plotting Steps for Plotting Statistical Data in Lists You can plot statistical data that is stored in lists. The six types of plots available are scatter plot, xyLine, histogram, modified box plot, regular box plot, and normal probability plot. Display and explore the graph. Chapter 12: Statistics 318 Scatter Scatter (")plots plot the data points from Xlist and Ylist as coordinate pairs, showing each point as a box ( > ), cross ( + ), or dot ( ). You can use the same list for Xlist and Ylist. xyLine xyLine ()is a scatter plot in which the data points are plotted and connected in order of appearance in Xlist and Ylist. You may want to use SortA( or SortD( to sort the lists before you plot them. Chapter 12: Statistics 319 Histogram Histogram () plots one-variable data. The Xscl window variable value determines the width of each bar, beginning at Xmin. [. . . ] 130, 143 dy/dx operation on a graph 130, 143, 151 E E (exponent) . 439, 576 Eng (engineering notation mode) 21, 576 ENTRY (last entry key) . 466 defining a 466 defining a table of values 467 setting the viewing window 470 tracing the graph 472 zooming in on the graph 474 zooming in on the table 468 cobweb attractors . 481 quadratic formula converting to a fraction 461 displaying complex results 463 entering a calculation 460 Sierpinski triangle . [. . . ]