HP Prime Graphing Wireless Calculator - Manual (Page 88)

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