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:YesNo

2.I have been sad for the last two weeks:YesNo

3.I have seen changes in my eating and sleeping:YesNo

4.I don't feel that life is going to get better:YesNo

5.I feel happy most of the day:YesNo

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)

*I need to learn how to correctly answer this question.