HP 40G manual Two-Proportion Z-Test, Successes in the two populations is equal, H0 π1 = π2

Results	The results are:
	Result	Description
	Test P	Proportion of successes in the sample.
	Test Z	Z–Test statistic.
	Prob	Probability associated with the Z–Test
		statistic.
	Critical Z	Boundary value of Z associated with the
		level you supplied.

Two–Proportion Z–Test

Menu name	Z–Test: P1 –P2
	On the basis of statistics from two samples, each from a
	different population, the 2 proportion Z–Test measures the
	strength of the evidence for a selected hypothesis against the
	null hypothesis. The null hypothesis is that the proportion of
	successes in the two populations is equal.
	(H0: π1 = π2).
	You select one of the following alternative hypotheses against
	which to test the null hypothesis:
		H1 π1 < π2
		H1 π1 > π2
		H1 π1 ≠ π2
Inputs	The inputs are:
	Field name	Definition
	;1	Sample 1 mean.
	X2	Sample 2 mean.
	n1	Sample 1 size.
	n2	Sample 2 size.
	α	Significance level.

9-12 Inference aplet