User Manual

1. Press CLEAR .
2. If you are summing one set of numbers, key in the first number and press
. Continue
until you have entered all of the values.
3. If you are summing two sets of numbers, key in the y-value and press
, key in
the x-value and press
. Continue until you have entered all of the values.
4. Press
to obtain the mean of the x-values.
5. Press
1 to obtain the standard error of the mean of the x-values.
6. Alternatively, press
1 to obtain the standard error for the
mean of the y-values.
Example: A sample of 6 one-bedroom apartment rentals reveals that one rents
for $190 per month unfurnished, one rents for $200 pre month, two rent for $205
per month, one rents for $216 per month, and one rents for $220 per month.
What are the mean monthly rental and the standard deviation? What is the
standard error of the mean?
Keystrokes Display
CLEAR
190
200
205
205 216
220
6.00 Total number of inputs.
206.00 Average monthly rent.
10.86 Standard deviation.
1
4.43 Standard error of the mean.
Mean, Standard Deviation, Standard Error for Grouped
Data
Grouped data are presented in frequency distributions to save time and effort in
writing down (or entering) each observation individually. Given a set of data
points
x
1
, x
2
, ... , x
n
with respective frequencies
f
1
, f
2
, ... , f
n