# Dr. Zak Case Study

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University of Phoenix Material Dr. Zak Case Study Instructions 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 TO EACH OF THE REMAINING QUESTIONS. 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. 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. Follow-Up Questions 1. SALLY SCORES 1.5 ON THIS TEST. HOW MANY STANDARD DEVIATIONS IS SALLY FROM THE MEAN? (SHOW YOUR CALCULATIONS) 2. Billy scores 5. What is his standard score? 3. What scale of measurement is Dr. Zak using? Do you think Dr. Zak’s choice of scaling is appropriate? Why or why not? What are your suggestions? 4. Do you think Dr. Zak has a good sample on which to norm his test? Why or why not? What are your suggestions? Doing a sampling of the demographics in college around the United States in 2009 it can be seen that 65% of the students are women and 45% are male. In Dr Zak’s test it was distributed as 70% female and 30% male. Of the distribution among races it was as follows: 65% White, 14% Black, 11% Hispanic, and .7% Asian. When looking at the test subjects for Dr Zak it is seen that 89% of the students were White, .04%