# One-tailed and Two-tailed Tests

You are doing a study examining the effects of studying method on academic achievement. All the students in your study take a course on genetics that lasts for 10 days. One group of students studies 20 minutes a day for 10 days. The second group studies once at the end of the course but for 200 minutes.

What is a one-tailed test? What is a two-tailed test? Explain at least three differences between one- and two-tailed tests.

State a hypothesis related to this study that would cause you to conduct a one-tailed test. State a hypothesis related to this study that would cause you to conduct a two-tailed test.

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#### Solution Preview

What is a one-tailed test? What is a two-tailed test? Explain at least three differences between one- and two-tailed tests.

Answer: One-tailed test happens if we want to test the difference between two groups in one direction (ie. either greater or lesser)

Two-tailed test happens if we want to test the difference between two groups in two ...

#### Solution Summary

One-tailed and two-tailed tests are examined. Hypothesis states related for studies are provided.