Texas Instruments -84 Plus, Manual Book

Page: 310 / 696

Chapter 12: Statistics 307
For each
STAT CALC
menu item, if neither
Xlistname
nor
Ylistname
is specified, then the
default list names are
L1
and
L2
. If you do not specify
freqlist
, then the default is 1
occurrence of each list element.
Frequency of Occurrence for Data Points Frequency of Occurrence for Data Points Frequency of Occurrence for Data Points Frequency of Occurrence for Data Points
For most
STAT CALC
menu items, you can specify a list of data occurrences, or
frequencies (
freqlist
).
Each element in
freqlist
indicates how many times the corresponding data point or data
pair occurs in the data set you are analyzing.
For example, if
L1={15,12,9,14}
and
Ù
FREQ={1,4,1,3}
, then the TI-84 Plus interprets the
instruction
1-Var Stats L1
,
Ù
FREQ
to mean that 15 occurs once, 12 occurs four times, 9
occurs once, and 14 occurs three times.
Each element in
freqlist
must be
‚
0, and at least one element must be > 0.
Noninteger
freqlist
elements are valid. This is useful when entering frequencies
expressed as percentages or parts that add up to 1. However, if
freqlist
contains
noninteger frequencies,
Sx
and
Sy
are undefined; values are not displayed for
Sx
and
Sy
in the statistical results.
1-Var Stats 1-Var Stats 1-Var Stats 1-Var Stats
1-Var Stats
(one-variable statistics) analyzes data with one measured variable. Each
element in
freqlist
is the frequency of occurrence for each corresponding data point in
Xlistname
.
freqlist
elements must be real numbers > 0.
1-Var Stats
[
Xlistname , freqlist
]