You want to know whether cookies made with unbleached flour taste better than cookies made with bleached flour; which of the following has the strongest experimental design to test this question?
A)Make two batches of cookies, both with bleached flour; one taster tries both types and ranks which type they like best.
B)Make two batches of cookies, one with bleached flour and one with unbleached flour; one taster tries both types and ranks which type they like best.
C)Make two batches of cookies, one with bleached flour and one with unbleached flour; twenty tasters try both types and rank which type they like best.
D)Make two batches of cookies, one with bleached flour and one with unbleached flour; twenty tasters try both types without knowing which ones they are eating and rank which type they like best.

Question

Quizplus · Accepted Answer

Option D is the best choice because it uses a double-blind experimental design where both the taster and the person conducting the experiment do not know which cookies are made with which flour. This eliminates any bias that could potentially influence the results. Additionally, using a larger sample size (twenty tasters) helps to increase the reliability of the results.

You Want to Know Whether Cookies Made with Unbleached Flour