HP 48gx

Lesson 31: Data and Statistics
Statistical data for the HP 48 are represented by matrices. Such a
matrix contains a row for each data point and a column for each
variable measured at that point.
var vars var,
pointy x11 Z12 Tim
pointy x21 Zao Tom
pomty Ini Ino Tnm
The Statistics application uses the data stored in the current statistical
matrix, stored in reserved variable Y DAT. You change the current
statistical matrix each time you work with a different set of data.
Example:
Find the mean and standard deviation for each variable in
the following set of sample data. The two variables are
the consumer price index (CPI) and the producer price
index (PPI) for the United States over a 5-year period:
Step 1:
C0)
fie
Select Zimole—uwar. .
Year CPI PPI
1 91 9.2
2 58 4.6
3 6.5 6.1
4 76 7.8
5 11.5 19.3
. from the STAT menu.
[i SINGLE-YARIABELE =TATISTICE wa
EDAT: coL: i
TYPE: Sample
_ MEAN _ STD DEV _ VARIANCE
_TOTAL _ MAXIMUM _ MINIMUM
EMTER STATISTICAL DATA
EOT [CHOOZ] | [CANCL] OK
Calculus, Statistics and Advanced Mathematics 7-7