HP 39gII

114 Inference app
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.
Inputs The inputs are:
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.
Field
name
Definition
Sample 1 mean.
Sample 2 mean.
n
1
Sample 1 size.
n
2
Sample 2 size.
x
1
x
2