Directional and Non-Directional
Hypotheses
When computing a t-test, it is
important to distinguish between directional and nondirectional hypotheses as
the direction will determine the rejection regions. Describe how the rejection
regions would differ according to the type of hypothesis you would use.
An insurance company asks you to
determine whether older drivers are safer than younger ones.
Provide a directional hypothesis
related to this study. Then, explain how you would need to change the
hypothesis so that it would be non-directional. What happens to the rejection
regions and why? Which of the two hypotheses do you think is more appropriate
and why?
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