Question

1. all of the following are ways to reduce bias in a study except: using a placebo using a double - blind study using animals in the study all of the above are examples of ways to reduce bias in a study

Explanation:

Using a placebo helps control for the placebo - effect bias. A double - blind study reduces experimenter and participant bias. Using animals in a study does not inherently reduce bias in a study related to human subjects. It may introduce other types of biases and confounding factors.

Answer:

C. Using animals in the study