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Specific Features of the HP-33E
21
Keystrokes
Display
5
5.0000
3
2.0000
9
9.0000
8
3.0000
2
3.0000
3
16.0000
4
98.0000
5
21.0000
6
155.0000
7
122.0000
Mean
Second pair is accumulated;
n = 2.
Third pair is accumulated;
n = 3.
Number of entries from R,,
(n = 3).
Sum of x values in Rj.
Sum of squares of x values
in R,.
Sum of y values in R;.
Sum of squares of y values
in Rg.
Sum of products of x and y
values in R;.
The
function is used to calculate the mean (arithmetic average)
of x and y values accumulated in the statistical registers.
When you press
=)
1.
The mean of x is calculated using the data accumulated in the
registers that contain n and 2x (R, and R;). The resultant value
for the mean of x is placed in the display and the X-register.
2.
The mean of y is calculated using the data accumulated in the
registers that contain n and 2y (R, and R;). The resultant value
for mean of y is placed in the Y-register. Simply press
to
bring that value into the X-register for use.
The easiest way to accumulate the data required for the
function is
by using the
function as described above.
Standard Deviation
The (2] function is used to calculate the sample standard deviation (a
measure of dispersion around the mean) of data accumulated in the
statistical registers. When you press [9](s]:
1.
The sample standard deviation of x is calculated using data
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