In a study of the effectiveness of vitamin C in reducing the incidence of colds in grade 6 students,, a researcher plans to distribute all the vitamin C pill bottles to the girls and all the placebo pill bottles to the boys. What should the researcher do differently?

Question

Quizplus · Accepted Answer

This is a double-blind study design where neither the researcher nor the students know which group they are in. This helps to eliminate potential bias and ensures that the results are valid. Randomization alone cannot guarantee that the groups are balanced in terms of potential confounding factors, and allowing students to choose may introduce self-selection bias.

In a Study of the Effectiveness of Vitamin C in Reducing