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What do the results mean – Texas Instruments TI-73 EXPLORER User Manual

Page 142

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136

Chapter 7: Statistical Analyses

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

9:00 AM Page 136 of 22

What Do the Results Mean?

1-Var Stats

and

2-Var Stats

variables are calculated and stored as

indicated below. To access these variables for use in

expressions, press - }

3:Statistics

and select the

appropriate menu. If you edit a list or change the type of

analysis, all statistical variables are cleared.

Variables

Definition

VARS Menu

x

or

y

Mean of all

x

or

y

values.

XY

G

x

or

G

y

Sum of all

x

values or

y

values.

G

G

x

2

or

G

y

2

Sum of all

x

2

values or

y

2

values.

G

Sx

or

Sy

Sample standard deviation of

x

or

y.

XY

s

x

or

s

y

Population standard deviation

of

x

or

y.

XY

n

Number of

x

or

x

,

y

data points.

XY

minX

minY

Minimum of

x

values or

y

values.

XY

maxX

maxY

Maximum of

x

values or

y

values.

XY

G

xy

Sum of

x

¦

y

for all

xy

pairs in

two lists.

G

Q

1

Median of the elements

between

minX

and

Med

(1st

quartile). Only calculated for

1-Var Stats

.

PTS

Med

Median of all data points.

PTS

Q

3

Median of the elements

between

Med

and

maxX

(3rd

quartile). Only calculated for

1-Var Stats

.

PTS