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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?
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
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.