Methods in Behavioral Research, psychology homework help

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Week Seven
Homework Exercise

Answer the
following questions, covering material from Ch. 13 of Methods in Behavioral Research:

  1. Define inferential statistics and how
    researchers use inferential statistics to draw conclusions from sample data.

  2. Define probability and discuss how it relates to
    the concept of statistical significance.

  3. A researcher is studying the effects of yoga on
    depression. Participants are randomly assigned to one of two groups: yoga and
    medication (experimental group); or support group and medication (control group).
    What is the null hypothesis? What is the research hypothesis?

  4. In the scenario described in the previous
    question, the researcher implements two programs simultaneously: a 6-week yoga
    program coupled with medication management and a 6-week support group program
    coupled with medication management. At the end of the 6 weeks, participants
    complete a questionnaire measuring depression. The researcher compares the mean
    score of the experimental group with the mean score of the control group. What
    statistical test would be most appropriate for this purpose and why? What is
    the role of probability in this statistical test?

  5. In the scenario described in the previous questions,
    the researcher predicted that participants in the experimental group—yoga plus
    medication—would score significantly lower on measures of depression than would
    participants in the control group—support group plus medication. True or false:
    A two-tailed test of significance is most appropriate in this case. Explain
    your response.

  6. Explain the relationship between the alpha level
    (or significance level) and Type I error. What is a Type II error? How are Type
    I and Type II errors different?

  7. A researcher is studying the effects of sex—male
    and female—and dietary sugar on energy level. Male and female participants
    agree to follow either a high sugar or low sugar diet for eight weeks. The
    researcher asks the participants to complete a number of questionnaires,
    including one assessing energy level, before and after the program. The
    researcher is interested in determining whether a high or low sugar diet
    affects reported energy levels differently for men and women. At the end of the
    program, the researcher examines scores on the energy level scale for the
    following groups: Men – low sugar diet; Men – high sugar diet; Women – low
    sugar diet; Women – high sugar diet. What statistic could the researcher use to
    assess the data? What criteria did you use to determine the appropriate
    statistical test?

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