Sample standard deviation – HP 35s Scientific Calculator User Manual
Page 172
12-6
Sample Standard Deviation
Sample standard deviation is a measure of how dispersed the data values are
about the mean sample standard deviation assumes the data is a sampling of a
larger, complete set of data, and is calculated using n – 1 as a divisor.
Press
() for the standard deviation of x–values.
Press
Õ
() for the standard deviation of y–values.
The (
σ) and (σ) items in this menu are described in the next section, "Population
Standard Deviation."
Example:
Sample Standard Deviation.
Using the same process–times as in the above "mean" example, May Kitt now
wants to determine the standard deviation time (s
x
) of the process:
Calculate the standard deviation of the times. (Treat all the data as x–values.)
Four data pairs
accumulated.
ÕÕ
(
)
Calculates the mean price
weighted for the quantity
purchased.
15.5
9.25
10.0
12.5
12.0
8.5
Keys:
Display:
Description:
()
Clears the statistics registers.
Enters the first time.
Enters the remaining data; six
data points entered.
()
Calculates the standard deviation
time.