Dr. Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women.

Read the following case study. Use the information in the case study to answer the accompanying follow-up questions. Although questions 1 & 2 have short answers, you should prepare a 150- to 200-word response for each of the remaining questions.

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Case Study

Dr. Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women. In this group, four persons were African American, six persons were Hispanic, and one person was Asian. Zak’s Miraculous Test of Depression is printed below:

1. 1. I feel depressed:                                                          Yes      No

       

   2. I have been sad for the last two weeks:                      Yes      No

       

   3. I have seen changes in my eating and sleeping:          Yes      No

       

   4. I don’t feel that life is going to get better:                 Yes      No

       

   5. I feel happy most of the day:                                      Yes      No

       

      Yes = 1; No = 0

       

      The mean on this test is 3.5 with a standard deviation of .5.

      1.   Do you think Dr. Zak has a good sample on which to norm his test? Why or why not? What are your suggestions?

      2.     What other items do you think need to be included in Dr. Zak’s domain sampling?

      3.    Suggest changes to this test to make it better. Justify your reason for each suggestion supporting