Two-Sample Z-Interval - HP 40gs User Manual

hp40g+.book Page 16 Friday, December 9, 2005 1:03 AM
Results

Two-Sample Z-Interval

Menu name
Inputs
Results
11-16
The results are:
Result Description
Critical Z Critical value for Z.
μ min Lower bound for μ.
μ max Upper bound for μ.
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, μ – μ
1
deviations, σ and σ
, are known.
1 2
The inputs are:
Field Definition
name
Sample 1 mean.
x1
Sample 2 mean.
x2
n1 Sample 1 size.
n2 Sample 2 size.
σ1
Population 1 standard deviation.
σ2
Population 2 standard deviation.
C Confidence level.
The results are:
Result Description
Critical Z Critical value for Z.
Lower bound for μ
Δ μ Min
Upper bound for μ
Δ μ Max
, when the population standard
2
– μ
.
1 2
– μ
.
1 2
Inference aplet