HP 40G manual Two-Sample T-Interval, Sample 1 mean

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, σ1and σ2, are unknown.
Inputs	The inputs are:
	Field name		Definition
	x 1		Sample 1 mean.
	x 2		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.
Results
	The results are:
	Result		Description
	Critical T		Critical value for T.
	Δ ∝ Min		Lower bound for ∝1 – ∝2.
	Δ ∝ Max		Upper bound for ∝1 – ∝2.

Inference aplet 9-21