HP 39gs Instruction Manual page 5

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HP 39gs Inference and Hypothesis Testing
In the PLOT view, we can see visually that the vertical line representing the sample mean is not within the region of rejection marked
by the R->.
Figure 18
From the evidence the teacher must reject the alternate hypothesis and conclude that it is not possible to say at the 5% level of
significance that his class has averaged significantly higher than the standardized population from which the test was drawn. He
should re-think either his proposed paper or his new teaching method. Alternatively, from the diagram in the PLOT view it seems that
his mean is not far from being significant. Perhaps he simply needs to collect more data in the hope that this may back up his view.
The result he has obtained is, after all, only a probability and further investigation may give a different view.
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