Texas Instruments TI-30X Teachers Guide - Page 110
Sx or Sy, A B C D E - 30xs standard deviation
UPC - 033317198726
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Quick Reference to Keys (Continued) A Key u L @ % \ Function Displays the following menu of stat 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 Sample standard deviation of x or y. sx or sy Population standard deviation of x or y. Gx or Gy Sum of all x values or y values. Gx2 or Gy2 Sum of all x 2 values or y 2 values. Gxy Sum of (x Q y) for all xy pairs in 2 lists. a Linear regression slope. b Linear regression y-intercept. r Correlation coefficient. Displays the following menu of variables. A B C D E Lets you select a variable in which to store the displayed value. The new variable replaces any previously stored value. rand Lets you set a seed value for random integers. Calculates the tangent. Calculates the inverse tangent. © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide For Teachers A-5