Casio fx9860G α x1σn–12, df, n1–1, n2–1, (1–C)2, Left = (o1 – o2)– tdf, Right = (o1 – o2)+ tdf, α x1σn–12

6-6-10

Confidence Interval

The following confidence interval applies when pooling is not in effect. α is the level of significance. 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–12n+1x2 σn–12

n1n2

Perform the following key operations from the statistical data list. 4(INTR)

2(t)

2(2-S)

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 26)
List(2) ...........................	list whose contents you want to use as data of sample 2
	(List 1 to 26)
Freq(1) .........................	frequency of sample 1 (1 or List 1 to 26)
Freq(2) .........................	frequency of sample 2 (1 or List 1 to 26)
Pooled ..........................	pooling On (in effect) or Off (not in effect)
Save Res .....................	list for storage of calculation results (None or List 1 to 26)
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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