HP 39g+ - Manual (Page 131)

Inference aplet 9-17
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,
µ
1 –
µ
2 , when the population standard
deviations,
σ
1
and
σ
2
, are known.
Inputs The inputs are:
Results The results are:
Field name Definition
Sample 1 mean.
Sample 2 mean.
n1 Sample 1 size.
n2 Sample 2 size.
σ
1 Population 1 standard deviation.
σ
2 Population 2 standard deviation.
C Confidence level.
x1
x2
Result Description
Critical Z Critical value for Z.
µ
Min Lower bound for
µ
1
–
µ
2
.
µ
Max Upper bound for
µ
1
–
µ
2
.
∆
∆