Chapter 7: Statistics Application
146
4. Tap [Next >>].
• This displays a screen for specifying conditions and inputting values.
• Initially, the top item on the screen will be selected, with help text about
the top item shown at the bottom of the screen. Tapping another item will
select it and display help text about it.
5. Input values and configure settings for each of the items on the screen.
6. Tap [Next >>].
• This displays the calculation results.
7. Tap
$
to graph the results.
• You cannot graph interval calculations
and inverse distribution calculations.
Tip:
You can back-step through the wizard
by tapping [<< Back]. After returning to a
previous screen you can change settings
and values and recalculate results. Closing
the wizard screen clears all settings and
values.
Tests
The
Z
Test provides a variety of different tests based on standard deviation based tests. They make it possible
to test whether or not a sample accurately represents the population when the standard deviation of a
population (such as the entire population of a country) is known from previous tests. The
t
Test is used instead
of the
Z
Test when the population standard deviation is unknown. You can also perform
χ
2
Test, ANOVA
(analysis of variance), and other test calculations.
The following describes the ClassPad commands for executing each type of statistical test calculation. It
includes the calculation formula used and a general overview of each command.
1-Sample
Z
Test
.... [Test] - [One-Sample Z-Test] .....
z
= (
o
–
μ
0
)/(
σ
/
'
n
)
Tests a single sample mean against the known mean of the null hypothesis when the population standard
deviation is known. The normal distribution is used for the 1-Sample
Z
test.
0702
To
specify
≠
0,
σ
= 3 for
n
(sample size) = 48,
o
(sample mean) = 24.5 data and perform a 1-Sample
Z
Test
