Understanding Experiments with Two Groups

I do not understand the worksheet for this project. Please explain. I have attached this to the file. Understanding Experiments with Two Groups Twenty sets of depressed twins are obtained for a study on the effects of a new antidepressant. In each twin set, one twin is assigned to receive the drug, and the other is designed to receive the placebo. Three months later, depression levels are measured on a scale from 1 (not at all depressed) to 7 (very depressed). The following data was obtained: Group 1 = Received drug Group 2 = Received placebo Variable = Depression level Group N Mean SD Group 1 10 3.21 1.035 Group 2 10 5.77 1.772 t = 5.785 df ... click for more

Psychological Statistics

In the following study, participants were randomly assgined to receive humanistic therapy, psychodynamic therapy, or behavioral therapy for their depression. Six months after therapy ended, participants levels of depression were rated on a likert scale from 1 not all drepressed to 15 extremely depressed. What can you tell me about this need help in this chart. Please see attachment.

A test to measure depression is assessed.

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 Aftican American, six persons were Hispanic, and one person was Asian. Zak's Miraculous Test of Depression is printed below: The mean on the test is 3.5 with a standard deviation of 5. 1. Sally scores 1.5 on this test. How many standard deviations is Sally from the mean?