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Chapter 4: Statistical Calculations
Quadratic regression calculation
Statistics of 1 and 2 and coefficients a, b, c
in the quadratic regression
formula (y = a + bx + cx
2
). (For quadratic regression calculations, no correla-
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.
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