6. (1pt) What is the first step to be performed in the following mathematical expression, EX-? a) Square each score b) Add the scores c) Add the squared scores d) Square the sum of scores 7. (3pt) What is the value of (EX)- for the scores 1, 6, 5, 9? Answer 8. (3pt) What is the value of E(X + 1) for the scores 1, 8, 2, 3? Answer 9. (3pt) What is the value of E(5X) for the scores 4, 8, 5, 3? Answer 10. (3pt) What is the value of EX+5 for the scores 9, 4, 8, 2, 7? Answer 11. (1pt) A recent study found a correlation between gum disease and heart disease. This result indicates that gum disease causes people to develop heart disease. TRUE or FALSE3. (1pt) After recording the final grade (A, B, C, D, F) for each individual in a class of N=26 students, the professor would like to display the grade distribution in a frequency distribution graph. What kind of graph should be used? a) A bar graph b) A histogram c) A Polygon d) LOL I DUNNO 4. (1pt) A sample of n = 5 scores has a mean of M = 12. What is E X for this sample? a) 12/5=2.40 b) 5/12=0.417 c) 5(12)=60 d) Cannot be determined