Manual

242 Inference app
The Numeric view is where you enter the sample statistics
and population parameters for the situation you are
examining. The sample data supplied here belong to the
case in which a student has generated 50 pseudo-random
numbers on his graphing calculator. If the algorithm is
working properly, the mean would be near 0.5 and the
population standard deviation is known to be
approximately 0.2887. The student is concerned that the
sample mean (0.461368) seems a bit low and it testing
the less than alternative hypothesis against the null
hypothesis.
Display the
test results
6. Display the test
results:
The test distribution
value and its
associated
probability are
displayed, along with the critical value(s) of the test
and the associated critical value(s) of the statistic. In
this case, the test indicates that one should not reject
the null hypothesis.
Tap to return to Numeric view.
Plot the test
results
7. Display a graphical
view of the test
results:
P
The graph of the
distribution is
displayed, with the
test Z-value marked. The corresponding X-value is also
shown.
Tap to see the critical Z-value. With the alpha
level showing, you can press
\ or = to decrease or
increase the -level.