HP 39g+ - Manual (Page 135)

Inference aplet 9-21
Two–Sample T–Interval
Menu name T–INT:
µ
1 –
µ
2
This option uses the Student’s t–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 unknown.
Inputs The inputs are:
Results The results are:
Field name Definition
1 Sample 1 mean.
2 Sample 2 mean.
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.
x
x
Result Description
Critical T Critical value for T.
µ
Min Lower bound for
µ
1
–
µ
2
.
µ
Max Upper bound for
µ
1
–
µ
2
.
∆
∆