QUESTION 8 Assume higher frequency of dietary supplement use is correlated with lower systolic blood pressure. What type of correlation is this? O A Negative correlation B. Positive correlation C. No correlation CD. None of the above QUESTION 9 All of the following statements are true about correlation coefficient r EXCEPT: A. Indicate the strength of the causal relationship between two variables B. Does not have any unit C. Measures the strength of the linear relationship between two variables D. Ranges from -1 to 1 QUESTION 10 Researchers wants to compare the mean age of men versus women who are dietary supplement users. Which test is the most appropriate to use? Note: Age is a continuous variable. A. Independent t-test B. Paired t-test Q C. Chi-square test D. None of the above