HP 39gs - Manual (Page 136)

11-12 Inference aplet
Inputs The inputs are:
Results The results are:
One-Sample T-Test
Menu name T-Test: 1 μ
The One-sample T-Test is used when the population
standard deviation is not known. On the basis of statistics
from a single sample, this test measures the strength of the
evidence for a selected hypothesis against the null
hypothesis. The null hypothesis is that the sample mean
has some assumed value,
Η
0
:μ = μ
0
You select one of the following alternative hypotheses
against which to test the null hypothesis:
Field name Definition
X1 Sample 1 mean.
X2 Sample 2 mean.
n1 Sample 1 size.
n2 Sample 2 size.
α Significance level.
Result Description
Test π1–π2 Difference between the
proportions of successes in the
two samples.
Test Z Z-Test statistic.
Prob Probability associated with the
Z-Test statistic.
Critical Z Boundary values of Z
associated with the α level that
you supplied.
H
1
: μ μ
0
<
H
1
: μ μ
0
>
H
1
: μ μ
0
≠
HP 39gs English.book Page 12 Wednesday, December 7, 2005 11:24 PM