According to Table 2, at the baseline for the nutrition counseling group, the proportion of subjects who ate at least five portions a day of fruits and vegetables was 0.267, and this increased by 0.287 over the 12 months. Report and interpret the 95% confidence interval for the change in the true proportion. Was this analysis for independent or dependent samples? Was this change in the proportion significantly larger, or smaller, than the change for the behavioral counseling group?

Medical research makes frequent use of statistical methods shown in this chapter. At British Medical Journal (BMJ) bmj.
com on the Internet, pull up the April 19, 2003, issue. Browse through the article titled “Behavioural counseling to increase consumption of fruit and vegetables in low income adults:
randomized trial” by A. Steptoe et al. You will see a variety of statistical analyses used.