A researcher examines the association between smoking status and the risk of preterm delivery that has 3 levels (low, high, and moderate). The researcher will perform this study on a sample of young African American pregnant women who smoke or do not smoke. What would be the best approach for summarizing these data and conducting an inferential test? A. Means and standard deviations by genotype, and ANOVA to test for differences among the groups B. Contingency table, conditional percentages, and chi-square statistic C. Contingency table with conditional percentages D. Side-by-side boxplot and independent samples t-test E. A pie chart, a point estimate and confidence interval for a proportion