The prevalence of plantar warts among girls entering kindergarten is 15% (95% CI: 10%-25%) and among boys entering kindergarten is 25% (95% CI: 20%-30%).Based on this information, would you conclude that there is a difference in prevalence of plantar warts between boys and girls entering kindergarten?

In the study conducted above, investigators surveyed 100 children, asked them if they had plantar warts, and observed if they were male or female. What change in the study design could they have made to increase precision of their confidence intervals?

Group of answer choices

Asked the children if they were boys or girls

Asked the parents if the children had had plantar warts

Increased the sample size

Asked the parents if they were boys or girls