HP 39g+ User Manual page 118

Inference aplet's SYMB view keys
9-2
The table below summarizes the options available in
Symbolic view.
Hypothesis
Tests
Z: 1 µ, the Z-Test
on 1 mean
Z: µ – µ
, the
1 2
Z-Test on the
difference of two
means
Z: 1 π, the Z-Test
on 1 proportion
Z: π1 – π2, the
Z-Test on the
difference in two
proportions
T: 1 µ, the T-Test on
1 mean
T: µ – µ
, the T-
1 2
Test on the
difference of two
means
If you choose one of the hypothesis tests, you can choose
the alternative hypothesis to test against the null
hypothesis. For each test, there are three possible choices
for an alternative hypothesis based on a quantitative
comparison of two quantities. The null hypothesis is
always that the two quantities are equal.Thus, the
alternative hypotheses cover the various cases for the two
quantities being unequal: <, >, and ≠.
In this section, we will use the example data for the Z-Test
on 1 mean to illustrate how the aplet works and what
features the various views present.
Confidence Intervals
Z-Int: 1 µ, the confidence
interval for 1 mean, based on
the Normal distribution
Z-Int: µ – µ
, the confidence
1 2
interval for the difference of
two means, based on the
Normal distribution
Z-Int: 1 π, the confidence
interval for 1 proportion,
based on the Normal
distribution
Z-Int: π1 – π2, the confidence
interval for the difference of
two proportions, based on the
Normal distribution
T-Int: 1 µ, the confidence
interval for 1 mean, based on
the Student's t-distribution
T-Int: µ – µ
, the confidence
1 2
interval for the difference of
two means, based on the
Student's t-distribution
Inference aplet