HP 39gs Graphing manual Two-Sample T-Interval, Pooled

Results	The results are:
	Result	Description
	Critical T	Critical value for T.
	μ Min	Lower bound for μ.
	μ Max	Upper bound for μ.

Two-Sample T-Interval

Menu name	T-INT: μ1 – μ2
	This option uses the Student’s t-distribution to calculate a
	confidence interval for the difference between the means
	of two populations, μ1 – μ2, when the population
	standard deviations, s1and s2, are unknown.
Inputs	The inputs are:
	Field	Definition
	name
	x1	Sample 1 mean.
	x2	Sample 2 mean.
	s1	Sample 1 standard deviation.
	s2	Sample 2 standard deviation.
	n1	Sample 1 size.
	n2	Sample 2 size.
	C	Confidence level.
	_Pooled	Whether or not to pool the samples
		based on their standard deviations.

Inference aplet 11-19