1. You are interested in knowing if persons who have experienced child abuse have greater mean levels of depression than persons who have not experienced child abuse. You take a sample of 39 victims of child abuse and find that their mean score on a depression scale (with higher scores indicating greater depression) is 14.30 with a standard deviation of 1.79. You take a sample of 24 people who have not experienced child abuse and find that their mean score on a depression scale is 12.13 with a standard deviation of 1.34.

1. Write your null and research hypotheses in symbols.
2. Is this a directional or non-directional hypothesis?
3. What are your degrees of freedom?
4. Calculate an independent samples t test.
5. Can you reject your null hypothesis? How do you know?
6. What can you conclude about your research?