Texas Instruments TI-30X Teachers Guide - Page 79

Statistics 12 Keys 1. % t displays a menu from which you can select 1-VAR, 2-VAR or CLRDATA. 1-VAR Analyzes data from 1 set of data with 1 measured variable-x. 2-VAR Analyzes paired data from 2 sets of data with 2 measured variables-x, the independent variable, and y, the dependent variable. CLRDATA Clears data values without exiting STAT mode. 2. v lets you enter data points (x for 1-VAR stats; x and y for 2-VAR stats). 1 3 2 3. % w displays the following menu that lets you clear data values and exit STAT mode. EXIT ST: Y N • Press < when Y (yes) is underlined to clear data values and exit STAT mode. • Press < when N (no) is underlined to return to the previous screen without exiting STAT mode. 4. u displays the menu of variables with their current values. n v or w Number of x (or x,y) data points. Mean of all x or y values. Sx or Sy sx or sy Gx or Gy Gx2 or Gy2 Gxy Sample standard deviation of x or y. Population standard deviation of x or y. Sum of all x values or y values. Sum of all x 2 values or y 2 values. Sum of (x Q y) for all xy pairs in 2 lists. a Linear regression slope. b Linear regression y-intercept. r Correlation coefficient. Notes • The examples on the transparency masters assume all default settings. • To save the last data point or frequency value entered, you must press < or $. • You can change data points once they are entered. © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide For Teachers 75