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 he likes 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 he likes 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

This option uses a blind test with a larger sample size, reducing bias and increasing reliability of the results.

You Want to Know Whether Cookies Made with Unbleached Flour