HP manual Confidence intervals, Confidence interval calculations that the HP 39G/40G can

Confidence intervals

	The confidence interval calculations that the HP 39G/40G can
	perform are based on the Normal Z–distribution or Student’s
	t–distribution.
One–Sample Z–Interval
Menu name	Z–INT: 1 ∝
	This option uses the Normal Z–distribution to calculate a
	confidence interval for ∝, the true mean of a population, when
	the true population standard deviation, σ, is known.
Inputs	The inputs are:
	Field name	Definition
	x	Sample mean.
	σ	Population standard deviation.
	n	Sample size.
	C	Confidence level.
Results
	The results are:
	Result	Description
	Critical Z	Critical value for Z.
	∝ min	Lower bound for ∝.
	∝ max	Upper bound for ∝.

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