Casio FX 1.0 PLUS, FX 2.0, FX 2.0 PLUS u 2-Sample Z Interval

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Confidence Interval (INTR)

After setting all the parameters, align the cursor with [Execute] and then press the function key shown below to perform the calculation.

• 1(CALC) ... Performs the calculation.

Calculation Result Output Example

Left ..............................	interval lower limit (left edge)
Right ............................	interval upper limit (right edge)
o ..................................	mean of sample
xσn-1 .............................	sample standard deviation
	(Displayed only for Data: List setting.)
n ..................................	size of sample

u 2-Sample Z Interval

2-SampleZ Interval calculates the confidence interval for the difference between two population means when the population standard deviations of two samples are known. The following is the confidence interval. The value 100 (1 – α) % is the confidence level.

	α									o1	: mean of sample 1
			2				2
Left = (o1 – o2) – Z				σ1		+		σ2		o2	: mean of sample 2
	2			n1				n2		σ1	: population standard deviation
		α
Right = (o1 – o2) + Z					σ12		+		σ22	σ2	of sample 1
		2			n1				n2		: population standard deviation
											of sample 2
										n1	: size of sample 1
										n2	: size of sample 2

Perform the following key operations from the statistical data list.

4(INTR)

b(Z)

c(2-Smpl)

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