HP 39g+ Graphing manual Two-Sample T-Interval, Pooled

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

Two-Sample T-Interval

Menu name	T-INT: ∝1 – ∝2
	This option uses the Student’s t-distribution to calculate a
	confidence interval for the difference between the means
	of two populations, ∝1 – ∝2, when the population
	standard deviations, s1and s2, are unknown.
Inputs	The inputs are:
	Field		Definition
	name
			Sample 1 mean.
		x1
			Sample 2 mean.
		x2
	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 9-19