HP 39g hp 39g & 40g_user's manual_English_E_pdfbpia5212.pdf - Page 135
Two-Sample T-Interval
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Two-Sample T-Interval Menu name Inputs 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, µ1 − µ2, when the population standard deviations, σ1and σ2, are unknown. The inputs are: Field name Definition x1 Sample 1 mean. x2 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. Results The results are: Result Critical T ∆ µ Min ∆ µ Max Description Critical value for T. Lower bound for µ1 - µ2. Upper bound for µ1 - µ2. Inference aplet 9-21
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
.
∆
∆