Quadratic Regression Coursework Materials | Winston-Salem Forsyth County Schools - Edubirdie

University:
Winston-Salem Forsyth County Schools
Course:
AP Calculus AB
Academic year:

2014
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402

Pages:

1
Author:

kynkoy1k4

Quadratic Regression (TI-83+, TI-84+ Graphing Calculator) A mathematical model is a mathematical description of a problem. For our purposes, these descriptions will be graphs and equations. We will find a model of the form y = ax 2 + bx + c , called the quadratic regression. Quadratic Regression is a process by which the equation of a parabola is found that “best fits” a given set of data. 1) Clear Y=. 2) TURN DIAGNOSTICS ON (to see the r value) catalog nd 2 0 D x −1 DiagnosticOn Enter Enter (The correlation coefficient, denoted by r, indicates how closely the line fits the data. It can vary from -1, which is a perfect fit for a negative correlation, to +1, which is a perfect fit for a positive correlation. The closer the correlation coefficient is to 1 or -1, the better the line fits the data.) 3) TURN STATPLOT ON StatPlot nd 2 Y= 1: Plot 1 Enter (highlight)On For Xlist, enter L1. For Ylist, enter L2 QUIT 4) ENTER DATA STAT 1:Edit (If there is any data in the lists, highlight the list name (Ex: L1) and press CLEAR, then ↓). Enter data into L1 and L2 QUIT 5) Check Scatterplot a) ZOOM 9 b) CLEAR 6) PERFORM QUADRATIC REGRESSION STAT →CALC 5:QuadReg( ax 2 + bx + c ) (Do not press enter.) L1 L2 ND ND 2 2 , , 1 2 VARS →YVARS 1:Function ENTER 1:Y1 ENTER ENTER 7) VIEW STATPLOT ZOOM 9: ZoomStat 8) VIEW X/Y CHART Table nd 2 GRAPH 9) Graph line on scatterplot: GRAPH

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