Sample Standard Deviation; Population Standard Deviation - HP 33s Owner's Manual

Sample Standard Deviation

Sample standard deviation is a measure of how dispersed the data values are
about the mean. standard deviation assumes the data is a sampling of a larger,
complete set of data, and is calculated using n – 1 as a divisor.
º +
Press
º +
Press
The {σ  } and {σ  } keys 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
15.5
12.5
Calculate the standard deviation of the times. (Treat all the data as x–values.)
Keys:
¹ ¡
{  }
/
15.5
/ /
9.25 10
/ /
12 8.5
º +
{  }

Population Standard Deviation

Population standard deviation is a measure of how dispersed the data values are
about the mean. Population standard deviation assumes the data constitutes the
complete set of data, and is calculated using n as a divisor.
º +
Press
º +
Press
11–6
Statistical Operations
File name 33s-E-Manual-1008-Publication(1st).doc
Printed Date : 2003/10/8
{  } for the standard deviation of x–values.
{  } for the standard deviation of y–values.
9.25
12.0
Display:


/
12.5 

σσ

{σ  } for the population standard deviation of the x–values.
{σ  } for the population standard deviation of the y–values.
Size : 13.7 x 21.2 cm
) of the process:
x
10.0
8.5
Description:
Clears the statistics registers.
Enters the first time.
Enters the remaining data; six
data points entered.
Calculates the standard
deviation time.
Page : 386