A consumer research firm is hired to determine which brand of laundry soap is most preferred by the consumer.Surveying a sample of housewives,they find the most preferred brand is "White Suds." Which of the following is the greatest threat to external validity in this study?
A) People really don't care about laundry products.
B) Laundry soaps do not differ between manufacturers.
C) The stereotypical assumption that only women do laundry.
D) White Suds is only available in a limited market.

Question

Quizplus · Accepted Answer

The greatest threat to external validity is the assumption that only women (housewives) do laundry, which limits the generalizability of the findings to the entire population, including men and others who do laundry.

A Consumer Research Firm Is Hired to Determine Which Brand