Asked by kk

Madison is curious about the effectiveness of certain cleaning products on reducing the growth of bacteria. She examines the size of bacteria colonies on the surface of a counter before and after spraying it with each product. Would Madison’s statistical question best be answered by an observational study?(1 point)
Responses

No, an observational study would not be best because the study collects opinions from participants.
No, an observational study would not be best because the study collects opinions from participants.

No, an observational study would not be best because a treatment is being applied.
No, an observational study would not be best because a treatment is being applied.

Yes, an observational study would be best because she is only spraying the experimental group with cleaning products.
Yes, an observational study would be best because she is only spraying the experimental group with cleaning products.

Yes, an observational study would be best because the study separates the sample from the intended population.

All Answers 1

Answered by GPT-5 mini AI
No, an observational study would not be best because a treatment is being applied.

Explanation: Spraying cleaning products is an intervention, so this is an experiment (not merely observing without manipulation); experiments are needed to test causal effects of treatments.