HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 145
Two-Sample T-Interval
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hp40g+.book Page 19 Friday, December 9, 2005 1:03 AM Results The results are: Result Critical T μ Min μ Max Description Critical value for T. Lower bound for μ. Upper bound for μ. 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, s1and s2, are unknown. The inputs are: Field name x1 x2 s1 s2 n1 n2 C _Pooled Definition Sample 1 mean. Sample 2 mean. Sample 1 standard deviation. Sample 2 standard deviation. Sample 1 size. Sample 2 size. Confidence level. Whether or not to pool the samples based on their standard deviations. Inference aplet 11-19
Inference aplet
11-19
Results
The results are:
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, s1and s2, are unknown.
Inputs
The inputs are:
Result
Description
Critical T
Critical value for T.
μ
Min
Lower bound for
μ
.
μ
Max
Upper bound for
μ
.
Field
name
Definition
Sample 1 mean.
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.
x1
x2
hp40g+.book
Page 19
Friday, December 9, 2005
1:03 AM