7- What is the difference between interval/ratio and ordinal variables? a. The distance between categories is equal across the range of interval/ratio data. b. Ordinal data can be rank ordered, but interval/ratio data cannot. c. Interval/ratio variables contain only two categories. d. Ordinal variables have a fixed zero point, whereas interval/ratio variables do not. 9- There is still a huge misconception about vaccines in many communities around the world. Your work is to convince a community about the benefits of DPT vaccine in preventing pertussis. If 3% of the patients with vaccine got the disease compared to 15% of children who didn't receive the vaccine, what is the relative risk reduction (RRR) that can be attributed to the vaccine intervention? a. 20% b. 5% c. 80% d. 45% 10- Ratio scales are like a. Nominal scales with the brackets b. Ordinal scales with ratios added c. Interval scales with a true zero points d. None of the above