Discuss direction and non-direction hypotheses and give an example of each.
The choice between a directional and a non-directional hypothesis test depends on the researcher’s beliefs about the population from which the sample was drawn and how much a priori information (either from theory or prior research) they have about the question. Directional hypothesis tests are referred to as “one-tailed” statistical tests, and non-directional hypothesis tests are called “two-tailed” statistical tests. The sample we drew came from a different population with a different mean. This is expressed in the alternative hypothesis. There are three possible versions of the alternative state of affairs:
1. The sample was drawn from a population with a different mean.
2. The sample was drawn from a population with a higher mean.
3. The sample was drawn from a population with a lower mean.
1. The sample was drawn from a population with a different mean.
2. The sample was drawn from a population with a higher mean.
3. The sample was drawn from a population with a lower mean.
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