HP 35s Scientific Calculator - Manual (Page 173)

Statistical Operations 12-7
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.
Press  ÕÕ ( σ) for the population standard deviation of the x–
values.
Press  ÕÕÕ ( σ) for the population standard deviation of
the y–values.
Example: Population Standard Deviation.
Grandma Hinkle has four grown sons with heights of 170, 173, 174, and 180 cm.
Find the population standard deviation of their heights.
Linear Regression
Linear regression, L.R. (also called linear estimation) is a statistical method for
finding a straight line that best fits a set of x,y–data.
Keys: Display: Description:
  ()
Clears the statistics registers.




Enters data. Four data points
accumulated.
 ÕÕ ( σ)   


Calculates the population
standard deviation.
Note To avoid a   message, enter your data before
executing any of the functions in the L.R. menu.