The STAT Menu and Statistical Functions (Continued)
Displays menu for means:
Arithmetic mean (average) of the x-values.
Arithmetic mean (average) of the y-values.
Weighted mean of the x-values weighted according to the
Displays menu for sample standard deviation:'
Standard deviation of the x-values.
Standard deviation of the y-values.
Displays menu for linear regression and linear estimation:
Estimate of x for a given value of y.
Estimate of y for a given value of x.
Slope of the calculated line.
v-intercept of the calculated line.
• The standard deviation is a measure of how dispersed the numbers are about the mean.
The HP-22S calculates the sample standard deviation, which assumes the data is a sam-
pling of a larger, complete set of data. If the data constitutes the entire population of data,
the true population, see page 64, ·Calculating the Population Standard Deviation."
The correlation coefficient is a number in the range -1 through
1 that measures how
closely the data fits the calculated line. A value of
1 indicates a perfect positive correla-
tion, -1 indicates a perfect negative correlation. A value close to 0 indicates the curve is a
One-Variable Statistical Calculations
If you enter a list of single numbers, they are stored as
can then calculate:
• Mean and standard deviation of
5: Statistical Calculations