Use the Following Information for Questions

Short Answer

Use the following information for questions:
A group of women suffering from various types of obsessive fear is given a therapeutic course to learn how to handle their fear. At the end of the course the women are given a questionnaire to determine how afraid they are. Six months after the course the women answer the questionnaire again as a follow-up measure. The fear-scores are typed into SPSS. Output is shown below.
-What is the value of the standard deviation of the differences that is missing from the output?