106 Statistics
ALG Mode:
5.
Press
gvz:1gr³ to obtain the standard error of the mean of the x-
values.
6.
Alternatively, press
gv~z:1gr³ 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 per 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?
12c platinum / 12C
RPN Keystrokes
12c platinum
ALG Keystrokes
Display Comments
fCLEARH fCLEARH
190_200_ 190_200_
205_205_ 205_205_
216_220_ 216_220_
6.00
Total number of inputs.
gÖ gÖ
206.00
Average monthly rent.
gv gv
10.86
Standard deviation.
:1grz z:1gr³
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
this procedure computes the mean, standard deviation, and standard error of the mean.
1.
Press
fCLEARH.
RPN Mode:
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.
ALG Mode:
2.
Key in the first value and press
³.
3.
Key in the respective frequency and press
?+0§~³gF~_. The
display shows the number of data points entered.
4. Repeat steps 2 and 3 for each data point.
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