Table 12-1 The Statistics Menu Items

Menu Item

Description

 

 

y Std. Dev

Standard deviation for y: a measure of how dispersed the y data values are about

 

the mean.

 

 

x Population Dev

Population Standard deviation for x: a measure of how dispersed the x data values

 

are about the mean, assuming the data constitutes a complete set of data.

 

 

y Population Dev

Population Standard deviation for y: a measure of how dispersed the y data values

 

are about the mean, assuming the data constitutes a complete set of data.

 

 

S.E.Samp.x

Standard error for the sample x: a measure of the dispersion of x mean, assuming

 

the data is a sampling of a large, more complete data set.

 

 

S.E.Samp.y

Standard error for the sample y: a measure of the dispersion of y mean, assuming

 

the data is a sampling of a large, more complete data set.

Pred x

Pred y

Predicts x for a given hypothetical value of y, based upon the model calculated to fit the data.

Predicts y for a given hypothetical value of x, based upon the model calculated to fit the data.

a

 

The a coefficient for the chosen regression model, which is the slope for a linear

 

 

model.

 

 

 

 

 

b

 

The b coefficient for the chosen regression model, which is the y-intercept for a linear

 

 

model.

 

 

 

 

 

 

 

 

 

c

 

The

c

coefficient for the chosen regression model, applies only for

2

.

 

 

 

 

ax +bx+c

Correlation

The correlation coefficient for the given (x, y) data. The correlation coefficient is a

 

 

number in the range -1 through 1 that measures how closely the calculated line fits

 

 

the data.

 

 

 

 

 

Covariance

A measure of how much two variables change in relation to one another.

 

 

 

 

 

 

Σx

 

The sum of the x values.

 

 

 

 

 

 

 

Σy

 

The sum of the y values.

 

 

 

 

 

 

Σx2

The sum of the squares of the x values.

 

 

Σy

2

The sum of the squares for the y values.

 

 

 

 

 

 

 

 

 

 

 

 

Σxy

The sum of the products of the x and y values.

 

 

 

 

 

Quartiles*

The boundaries of a given frequency distribution divided into four parts.

 

 

 

 

 

Median*

The middle value in a given frequency distribution.

 

 

 

 

 

 

Maximum*

The largest value in a given frequency distribution.

 

 

 

 

 

 

Minimum*

The lowest value in a given frequency distribution.

 

 

 

 

 

 

 

 

 

*Does not apply to the HP 20b.

Statistical Operations 71