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Inference app 251
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:
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, , is known.
Inputs The inputs are:
Results The results are:
Two-Sample Z-Interval
Menu name Z-Int:
1
–
2
This option uses the Normal Z-distribution to calculate a
confidence interval for the difference between the means
of two populations,
–
, when the population standard
deviations,
1
and
2
, are known.
Field
name
Definition
Sample mean
n Sample size
Population standard deviation
C Confidence level
x
Result Description
CConfidence level
Critical Z Critical values for Z
Lower Lower bound for
Upper Upper bound for