HP 40G manual Sample 1 standard deviation, Sample 2 standard deviation

Inputs	The inputs are:
	Field name	Definition
	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.
	α	Significance level.
	_Pooled?	Check this option to pool samples based on
		their standard deviations.
Results
	The results are:
	Result	Description
	Test T	T–Test statistic.
	Prob	Probability associated with the T–Test
		statistic.
	Critical T	Boundary values of T associated with
		the α level that you supplied.

Inference aplet 9-15