Texas Instruments TI-84 Guidebook - Page 243
LinRegTTest, <0, RegEQ, VARS Statistics EQ, L3={38
UPC - 033317190171
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LinRegTTest LinRegTTest (linear regression t test; item F) computes a linear regression on the given data and a t test on the value of slope b and the correlation coefficient r for the equation y=a+bx. It tests the null hypothesis H0: b=0 (equivalently, r=0) against one of the alternatives below. • Ha: bƒ0 and rƒ0 (b & r:ă0) • Ha: b0) The regression equation is automatically stored to RegEQ (VARS Statistics EQ secondary menu). If you enter a Y= variable name at the RegEQ: prompt, the calculated regression equation is automatically stored to the specified Y= equation. In the example below, the regression equation is stored to Y1, which is then selected (turned on). In the example: L3={38, 56, 59, 64, 74} L4={41, 63, 70, 72, 84} Input: Calculated results: When LinRegTTest is executed, the list of residuals is created and stored to the list name RESID automatically. RESID is placed on the LIST NAMES menu. Note: For the regression equation, you can use the fix-decimal mode setting to control the number of digits stored after the decimal point (Chapter 1). However, limiting the number of digits to a small number could affect the accuracy of the fit. Chapter 13: Inferential Statistics and Distributions 236