Texas-instruments TI-73 EXPLORER User Manual download pdf (Page 143)

Chapter 7: Statistical Analyses

137

7307ENG.DOC CH 7, Statistical Analyses, English Julie Hewlett Revised: 07/29/98 12:07 PM Printed: 05/19/99

9:00 AM Page 137 of 22

Variables Definition VARS Menu

Correlation coefficient

or R

Coefficient of determination

RegEQ

Regression equation

x1,y1,x2,y2,

x3,y3

Summary points

PTS

a, b, c

Regressionà fit coefficients

n (number of data points)

=number of

data points in a

1-Var Stats

analysis or the

number of

and

data points in a

2-Var Stats

analysis. Since

both variable lists always have the same number of list

elements in

2-Var Stats

for

is always equal to

for

Therefore,

applies to both the

and

analyses.

freq (Frequency Lists)

If freq is specified,

is equal to the sum of the elements in that

list. For example, if the freq is {2,2,3,1,2},

={2+2+3+1+2}=10.

, Q

, and Med

, and

Med

are undefined if the freq contains non-integer

values. They also are not calculated if the freq contains a value

larger than 99.

RegEQ

The calculator stores the most recently generated regression

equation (see - v

CALC

menu items 37) to the variable,

RegEQ

. If, for example, you execute

5: LinReg(ax+b)

, but you

dont initially store

RegEQ

to a

variable, you can later insert

RegEQ

into the Y= editor. The calculator graphs the regression

equation when it is selected.

If the frequency for an element or data pair is 0, the element or

data pair is ignored in the calculation.

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Texas-instruments TI-73 EXPLORER User Manual Page 143

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