HP 40gs - Manual (Page 145)

Inference aplet 11-19
Results The results are:
Two-Sample T-Interval
Menu name 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.
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