To estimate the proportion of city residents who shop online, a researcher visits a mall on a weekday morning and asks people she encounters to share their experiences with online shopping, including this question: "Do you shop online at least once each week?” The results show that 32 percent of shoppers shop online at least once per week. Which of these describes a likely source of bias present in the survey results?
Answer
A
Response bias may be present because people may not be truthful with their responses.
B
Nonresponse bias may be present because people in a mall may not want to answer questions.
C
Question wording bias may be present because the question asked may exclude important information.
D
Undercoverage bias may be present because people in the workforce and many younger people could be excluded.