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24. A study involved patients taking a vitamin C capsule or a placebo. Researchers are interested in the effect of vitamin C on the occurrence of scurvy. What type of classification is this? a. Q->C b. C->Q C. C->C d. Q-->Q 25. A study was done linking particular Halloween candy to cavities. Researchers are interested if a specific type of candy resulted in more cavities than another type of candy. What type of classification is this? a. Q->C b. C->Q c. C->C d. Q->Q 26. A study involved patients taking a vitamin C capsule or a placebo. Researchers are interested in the effect of vitamin C on the occurrence of scurvy. Which graphical display and numerical measure are appropriate? a. Side-by-side box plots; five-number summaries b. Two-way table; conditional percentages c. Scatterplot; slope d. Histogram; frequency counts