Question

Part 1: Imagine that you were a participant in an experiment where you were asked to eat cookies and rate how much you liked each cookie on a scale from 1 to 5, where higher ratings mean higher liking of the cookie. You are asked to eat an Oreo cookie and rate it and then eat a Chips Ahoy cookie and rate it. For this experiment, answer the questions below. . What are some of the potential biases in this experiment? How do you think you could adjust the procedure to improve the internal validity?

Answer 1

Order effect bias could happen where the order of one cookie place before an after another could influence or have an effect on the result.

Another bias which could happen is that the same person rating two different cookies may compare one another or one cookie may have an effect or reaction rewards another cookie.

To strengthen the internal validity of this study, the design could be changed to between subjects design, where there are two groups and each group is given one type of cookie and the difference is mesured.