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

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