Directional and nondirectional hypotheses can be easily interchanged according t

Question

Directional and nondirectional hypotheses can be easily interchanged according to the hypothesis the researcher is testing. For instance, a drug company might predict that a drug will help a subject lose weight while another drug company might predict that a drug will alter a subject's weight.

Describe a situation in which you would test a directional hypothesis. Be sure to state the independent variables (e.g., drug or placebo) and the dependent variables (e.g., weight loss) clearly and explain why the hypothesis is directional. Then, revise the same situation to make it nondirectional. Explain which according to you is more appropriate and why. Evaluate the practice of altering the alpha level so that a two-tailed test will have a 5% rejection region on both sides of the curve for a total of 10% instead of having a 2.5% rejection region on both sides in order to maintain a 5% alpha.

Explanation / Answer

Here we can take a hypothesis test where we have independent variable, male adults and female adults and dependnet variable their height.

Here one directional hypothesis test is that we are testing that adults male have more average height than adult females. Here we re checking the direction of height so it can be a onedirectional test. We can take an alpha = 0.05 and take a sample for both the groups and do one directional hypothesis testing.

Similarly, the two direction hypothesis testing resaerch question would be that adult males have different average height than adult females. That would be a two directional test and we take an alpha = 0.10 here.

Here the one direction alpha test is more approporiate here as it tells us a direction of heights among two genders.

Yes, as 5% one directional alpha test when changed to two directional alpha, the alpha will be changed to 0.10 so that in each direction there could be 0.05 significance would be there for better results.

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