5. Three groups of research participants have played a game with various amounts of violence and were assessed on a stress-related scale (where 0 = no stress, 100 = very stressed) afterwards. The first group of participants (Group 1) have played a non-violent game. The second group of participants (Group 2) have played a moderately violent game. The third group of participants (Group 3) have played a very violent game. The researchers would like to know if the results on a stress scale differ for these groups. a. State the null hypothesis (2 points): b. State the research hypothesis (2 points):Using the GSS18SSDS-a data set and the SPSS software complete the following problems: 6. Calculate the 90% confidence interval for the variable "Highest year of school completed" [EDUC] comparing lower, working, middle, and upper classes (variable: "Subjective class identification" [CLASS]) in the GSS sample. Use the Explorer procedure using CLASS as your factor variable. Make a summary statement of your findings. Paste the Table from the SPSS Output (10 points): Your summary (6 points)