HP Prime Graphing NW280AAABA Confidence intervals, One-Sample Z-Interval, Two-Sample Z-Interval

Confidence intervals

The confidence interval calculations that the HP Prime can perform are based on the Normal Z-distribution or Student’s t-distribution.

One-Sample Z-Interval

Menu name	Z-Int: 1 μ
	This option uses the Normal Z-distribution to calculate a
	confidence interval for μ, the true mean of a population,
	when the true population standard deviation, σ, is known.
Inputs	The inputs are:

Field Definition name

xSample mean

nSample size

σPopulation standard deviation

CConfidence level

Results The results are:

Result Description

CConfidence level

Critical Z Critical values for Z

Lower	Lower bound for μ
Upper	Upper bound for μ

Two-Sample Z-Interval

Menu name	Z-Int: μ1 – μ2
	This option uses the Normal Z-distribution to calculate a
	confidence interval for the difference between the means
	of two populations, μ1– μ2, when the population standard
	deviations, σ1 and σ2, are known.

Inference app 253