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    Time to Practice: Week 3

    Complete both Part A and Part B below.

    Part A

    1. For the each of following research questions (note there are two), create one null hypothesis, one directional research hypothesis, and one non-directional research hypothesis.

    a. What are the effects of attention on out-of-seat classroom behavior? (create 3 hypotheses)

    b. What is the relationship between the quality of a marriage and the quality of the spouses’ relationships with their siblings? (create 3 hypotheses)

    2. Provide one research hypothesis and an equation for each of the following topics:

    a. The amount of money spent on food among undergraduate students and undergraduate student-athletes.

    b. The effects of Drug A and Drug B on a disease.

    c. The time to complete a task in Method 1 and Method 2.

    3. Why does the null hypothesis presume no relationship between variables?

    4. Create a research hypothesis tested using a one-tailed test and a research hypothesis tested using a two-tailed test.

    5. What does the critical value represent?

    6. Given the following information, would your decision be to reject or fail to reject the null hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for your conclusion.

    a. The null hypothesis that there is no relationship between the type of music a person listens to and his crime rate (p < .05).

    b. The null hypothesis that there is no relationship between the amount of coffee consumption and GPA (p = .62).

    c. The null hypothesis that there is no relationship between the number of hours worked and level of job satisfaction (p = .51).

    7. Why is it harder to find a significant outcome (all other things being equal) when the research hypothesis is being tested at the .01 rather than the .05 level of significance?

    8. Why should we think in terms of “failing to reject” the null rather than just accepting it?

    9. When is it appropriate to use the one-sample z test?

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