Sharp EL-5250, EL-5230 Single-variable statistical calculation, Linear regression calculation

Chapter 4: Statistical Calculations

The following statistics can be obtained for each statistical calculation (refer to the table below):

	Variables	Contents	Key operations
	n	Number of samples	I00
	¯x	Mean of samples (x data)	I01
Q	sx	Sample standard deviation (x data)	I02
	σ x	Population standard deviation ( x data)	I03
	Σx	Sum of samples (x data)	I04
	Σx2	Sum of squares of samples (x data)	I05
	¯y	Mean of samples (y data)	I06
	sy	Sample standard deviation (y data)	I07
	σ y	Population standard deviation ( y data)	I08
	Σy	Sum of samples ( y data)	I09
W	Σy 2	Sum of squares of samples ( y data)	I0A
	Σ x y	Sum of products of samples (x, y )	I0B
	a	Coefficient of regression equation	I20
	b	Coefficient of regression equation	I21
	c	Coefficient of quadratic regression equation	I22
	r	Correlation coefficient	I23

• Use I key to perform a STAT variable calculation.

Single-variable statistical calculation

Statistics of 1 and value of the normal probability function

Linear regression calculation

Statistics of 1 and 2 for a given x (estimate

(except coefficients c) and, in addition, estimate of y y´) and estimate of x for a given y (estimate x´)

Exponential regression, logarithmic regression, power regression, and inverse regression calculation

Statistics of 1 and 2 (except coefficients c). In addition, estimate of y for a given x (estimate y´) and estimate of x for a given y (estimate x´). (Since the calculator converts each formula into a linear regression formula before actual calculation takes place, it obtains all statistics, except coefficients a and b, from converted data rather than entered data.)

62