HP 48G - Page 29

Now suppose your data represent exam scores—3
midterms and a final exam—for each of 7 students.
Example: Compare the mean and (population) stan-
dard deviation of the first exam (column 1) with those
of the final exam (col. 4). Press and select
Single—war.. Atthe Zoat: field, use to
indicate the matrix named TEST'S. Then settOL: to
1, mvPE: toFPopulat ion, the _MEAN and
-5To pEY fields, and press THll. Tagged results go
ontothestack (Mlean: 73.4Z...;5td Deu: 15.84...).
Just repeat this process (but use col. 4) to compare.
Not:ce the other calculation options you have under
S 1mgle—war., statistics (- TOTAL, -MAKIMUM, etc.).
Also explore the other handy (2)STAT) tools:
Frequencies.., lets you study data distribution
by defining bins—intervals of value—then calculating
how many data points fall into each bin.
Fit dat a.. examines correlations between any 2
designated columns of data in ZDAT. You can try lin-
ear, logarithmic, exponential or power-curve models.
Summarydg st at s, computes the often-used
quantities Xx, Xy, Xx?, Xy? Xxy and Xn (for any 2 col-
umns you designate as x and y in ZDAT).
Note that, although most of the matrix-building and
mathematical matrix-crunching commands are of-
fered via (MTH), the matrix statistical commands are
under (&)STAT) (see the Command Index, pp. 41-77,
for individual details on these commands):
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T+E- [CLE [ZoRT] [STAT]
HMODL ZPAF [REZET] INFO
IINN e T
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LINFI [LOGFI| EXPFI|PLREFI|EEZTF| EPAF
WAk [PEDEV|PYAR] | STAT|
(101) A
ScATRl | STAT]
(102) IZIM
ZLIME| LF [PREDH|PREDY] CORE COV
(pcov] [ ] [sTAT]
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N EEE A
I I e
(MATRIX], and(z) 27
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