Question

people are weighed on the same scale each week over 3 months at a gym. prior to weigh - ins, they complete an exercise routine together and drink one bottle of water. what is a possible confounding factor in a diet study over 3 months? scale being used bottle of water to drink people not exercising the required number of minutes outside the weigh - in day exercise routine at the gym

Explanation:

A confounding factor is a variable that affects both the independent variable (diet in this case) and the dependent variable (weight). The exercise routine at the gym is a factor that is part of the study setup (along with the diet) and can influence weight loss. The scale being used is a measurement tool (assuming it's consistent), the bottle of water is a minor short - term fluid intake (not likely to have a long - term confounding effect on weight over 3 months compared to exercise), and people not exercising outside weigh - in day is more about compliance rather than a direct confounding factor in the study design as presented.

Answer:

Exercise routine at the gym