108
this procedure computes the mean, standard deviation, and standard
error of the mean.
1. Press CLEAR .
2. Key in the first value and press .
3. Key in the respective frequency and press 0 . The
display shows the number of data points entered.
4. Repeat steps 2 and 3 for each data point.
5. To calculate the mean (average) press 0 1 6 3
.
6. Press to find the standard deviation.
7. Press 0 to find the standard error of the mean.
Example 1: A survey of 266 one-bedroom apartment rentals reveals that
54 rent for $190 a month unfurnished, 32 rent for $195 per month, 88 rent
for $200 per month, and 92 rent for 206 per month. What are the average
monthly rental, the standard deviation, and the standard error of the mean?
Use the following HP-12C program for the previous example:
Keystrokes Display
CLEAR
190
54 0
1.00 First data pair entered.
195
32 0
2.00 Second data pair entered.
200
88 0
3.00 Third data pair entered.
206
92 0
4.00 Fourth data pair entered.
0 1 6
3
199.44 Average monthly rent.
5.97 Standard deviation.
0
0.37 Standard error of the mean.
KEYSTROKES DISPLAY
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