A company wants to try out two new toothpaste brands (Brand A and Brand B) on their customers who already use the company’s current toothpaste. Which of these stages would NOT figure into an appropriate experimental design?

A: Selecting customers randomly and classifying them into two groups.

B:Asking one group of customers to try Brand A and another group to try Brand B.

C: Asking customers for their feedback.

D:Asking all company sales staff to use the two toothpastes and make comments.

Question

A company wants to try out two new toothpaste brands (Brand A and Brand B) on their customers who already use the company’s current toothpaste. Which of these stages would NOT figure into an appropriate experimental design?

A: Selecting customers randomly and classifying them into two groups.

B:Asking one group of customers to try Brand A and another group to try Brand B.

C: Asking customers for their feedback.

D:Asking all company sales staff to use the two toothpastes and make comments.

anonymous · Answer

It is B