Casio FX 1.0 PLUS, FX 2.0, FX 2.0 PLUS manual 44

1-3-10

Confidence Interval (INTR)

The following confidence interval applies when pooling is not in effect. The value 100 (1 – α) % is the confidence level.

Left = (o1 – o2)– tdf					α x1σn–12				x2 σn–12
								+
					2		n1			n2
Right = (o1 – o2)+ tdf						α x1σn–12			+	x2 σn–12
						2	n1			n2
df =	1
		C2		(1–C)2
			+
		n1–1		n2–1

x1σn–12

C = x1σn–12n1x2 σn–12

n1 + n2

Perform the following key operations from the statistical data list.

4(INTR)

c(T)

c(2-Smpl)

The following shows the meaning of each item in the case of list data specification.

Data ............................	data type
C-Level ........................	confidence level (0 <C-Level < 1)
List(1) ..........................	list whose contents you want to use as data of sample 1
	(List 1 to 20)
List(2) ..........................	list whose contents you want to use as data of sample 2
	(List 1 to 20)
Freq(1) ........................	frequency of sample 1 (1 or List 1 to 20)
Freq(2) ........................	frequency of sample 2 (1 or List 1 to 20)
Pooled .........................	pooling On (in effect) or Off (not in effect)
Save Res .....................	list for storage of calculation results (None or List 1 to 20)
Execute .......................	executes a calculation

The following shows the meaning of parameter data specification items that are different from list data specification.

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