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For each of the questions, (i) identify all of the variables involved; (ii) classify each variable as qualitative or quantitative; (iii) identify the independent variable(s) and the dependent variable(s), (iv) choose a hypothesis test which would be appropriate; (v) indicate what graphical display(s) could be used to best display results.

1. What is the relationship between systolic blood pressure and smoking habits (nonsmoker, smoker)?

2. What is the difference in systolic blood pressure between nonsmokers and smokers?

3. What is the relationship between systolic blood pressure and smoking habits (none, light, heavy) if

(a) we treat "smoking habits" as having a nominal level?

(b) we treat "smoking habits" as having an ordinal level?

4. What is the difference in systolic blood pressure among nonsmokers, light smokers, and heavy smokers if

(a) we treat "smoking habits" as having a nominal level?

(b) we treat "smoking habits" as having an ordinal level?

5. What is the relationship between type of job (secretarial, sales, executive) and smoking habits (none, light, heavy) if

(a) we treat both variables as having a nominal level?

(b) we treat both variables as having an ordinal level?

(c) we treat only "smoking habits" as having an ordinal level?

6. What is the difference in distribution of nonsmokers, light smokers, and heavy smokers among secretaries, salespersons, and executives if

(a) we treat both variables as having a nominal level?

(b) we treat both variables as having an ordinal level?

(c) we treat only "smoking habits" as having an ordinal level?

7. What is the relationship between type of job (secretarial, sales, executive) and weekly nicotine intake?

8. What is the difference in weekly nicotine intake among secretaries, salespersons, and executives?

9. What is the difference in weekly nicotine intake among secretaries, salespersons, and executives, and among males and females?

10. What is the difference in weekly nicotine intake for smokers immediately before attending a seminar and 6 weeks after the completion of the seminar?

11. What is the difference in weekly nicotine intake for smokers immediately before attending a seminar, 6 weeks after the completion of the seminar, and 12 weeks after the completion of the seminar?

12. What is the relationship between systolic blood pressure and weekly nicotine intake?

13. What is the relationship between systolic blood pressure and age?

14. What is the difference in systolic blood pressure between males and females?

15. What is the difference in systolic blood pressure between males and females, controlling for age?