To test the effectiveness of using a dab of honey to prevent infection in a cut, parents of children in a childcare facility were instructed to wash the wounds of their children with soap and water and then place a dab of honey on the cut. each cut was then monitored for infection. at the end of the study, the percentage of the twenty eight children who had cuts that became infected was computed. what does this study need in order to establish causation?
have half the wound covered in honey and half not covered.
add a control group where children's wounds are washed with soap and water, and a honey appearing substance with no active ingredient is applied.
ask the parents to choose whether to cover the wound with honey or leave it uncovered. then have them report what they did and the results.