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Regression equations with a ti-83 or 84
- 1. REGRESSION EQUATIONS WITHA TI-83/84 CALCULATOR 1) Turn STAT PLOTS ON – necessaryif enteringstatistical datatosee a scatterplot - 2ND thenY= - Choose 1:PLOT 1 - Move cursorover ON thenENTER - Move downso TYPE ishighlightingscatterplot(firstchoice) XLIST press2ND and 1 for 𝐿1 YLIST press2nd and2 for 𝐿2 MARK – yourchoice COLOR – your choice 2) To clearolddata - STAT and 1: EDIT - Move cursorover 𝐿1 and CLEAR,ENTER - Move cursorover 𝐿2 and CLEAR,ENTER 3) To enterdata - Once you’ve clearedolddata, move cursorunder 𝐿1 and enterall x valuesinyourdata - Move to 𝐿2 to enterall yvalues 4) To see scatterplot - ZOOMand 9:ZOOMSTAT 5) To calculate the line/curve of bestfit - STAT – move cursor across to CALC - Choose correctregressiontype,forexample 4:LINREGif linearequationor5:QUADREG if quadraticequation - Make sure XLIST is 𝐿1 and YLIST is 𝐿2 - Move downtocalculate and ENTER 6) To copyand paste equationtosee line/curve of bestfitoverthe scatterplot - Y= - VARS - 5:STATISTICS - Move overto EQ - 1:RegEQ - GRAPH to see scatterplotandline/curveof bestfit 7) To use line/curve of bestfittointerpolateorextrapolate forx ory values a) To findmissingyvalue whengivenx GRAPH,2ND and TRACE,1:VALUE andenteryourx value andENTER b) To findmissingx value whengiveny Y= to enteranotherequationwithyouryvalue, GRAPH,2ND and TRACE 5:INTERSECT to findpointof intersectionof line/curve of bestfitandyoury value andENTER three timestosee corresponding value toyoury value ***Remember to turn OFF STAT PLOTS if you are given an equation that you want to graph***