Quadratic Regression Calculation; Data Entry And Correction; Data Entry; Data Correction - Sharp EL-5230 Operation Manual

Quadratic regression calculation

Statistics of 1 and 2 and coefficients a, b, c in the quadratic regression
formula (y = a + bx + cx
tion coefficient (r) can be obtained.)

Data Entry and Correction

All data entered is kept in memory until STAT memory clear (@ P
2 y) is operated or a new STAT sub-mode is selected. Before
entering new data, clear the memory contents.

Data entry

Single-variable data
Data _
Data , frequency _ (To enter multiples of the same data)
Two-variable data
Data x , Data y _
Data x , Data y , frequency _ (To enter multiples of the
same data x and y.)
• Up to 100 data items can be entered. With single-variable data, a data item
without frequency assignment is counted as one data item, while an item
assigned with frequency is stored as a set of two data items. With two-
variable data, a set of data items without a frequency assignment is
counted as two data items, while a set of items assigned with frequency is
stored as a set of three data items.

Data correction

Correction prior to pressing _ immediately after a data entry:
Delete incorrect data with j, then enter the correct data.
). (For quadratic regression calculations, no correla-
2
Chapter 4: Statistical Calculations
63