HP 50G, Руководство пользователя

Страница: 577 / 887

Page 18-10
Θ
Press
@CANCEL
to return to the previous screen. Change the V-view and Bar
Width once more, now to read V-View: 0 30, Bar Width: 10. The new
histogram, based on the same data set, now looks like this:
A plot of frequency count, f
i
, vs. class marks, xM
i
, is known as a frequency
polygon. A plot of the cumulative frequency vs. the upper boundaries is
known as a cumulative frequency ogive. You can produce scatterplots that
simulate these two plots by entering the proper data in columns 1 and 2 of a
new
Σ
DAT matrix and changing the
Type
: to
SCATTER
in the PLOT SETUP
window.
Fitting data to a function y = f(x)
The program
3. Fit data..
, available as option number 3 in the STAT menu, can
be used to fit linear, logarithmic, exponential, and power functions to data sets
(x,y), stored in columns of the
Σ
DAT matrix. In order for this program to be
effective, you need to have at least two columns in your
Σ
DAT variable.
Example 1 – Fit a linear relationship to the data shown in the table below:
x 0 1 2 3 4 5
y 0.5 2.3 3.6 6.7 7.2 11