Two–Sample T–Interval - HP 40G User Manual

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Two–Sample T–Interval
Menu name
Inputs
Results
Inference aplet
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T–INT: µ1 – µ2
This option uses the Student's t–distribution to calculate a
confidence interval for the difference between the means of
two populations, µ − µ , when the population standard
1 2
deviations, σ and σ
, are unknown.
1 2
The inputs are:
Field name Definition
1
Sample 1 mean.
x
Sample 2 mean.
x 2
s1 Sample 1 standard deviation.
s2 Sample 2 standard deviation.
n1 Sample 1 size.
n2 Sample 2 size.
C Confidence level.
_Pooled Whether or not to pool the samples based
on their standard deviations.
The results are:
Result Description
Critical T Critical value for T.
Lower bound for µ
∆ µ Min
Upper bound for µ
∆ µ Max
– µ
.
1 2
– µ
.
1 2
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