Question

which of the following may not cause undercoverage of older people in surveys of the general population?
o a. online surveys
o b. surveys that employ randomly dialed cell phone numbers
o c. surveys conducted at shopping malls
o d. none of the above

Explanation:

Older people may not be as tech - savvy or have access to online surveys (a). They may also be less likely to be at shopping malls (c) compared to younger people. However, randomly dialed cell phone numbers (b) can reach a wide range of age groups, including older people.

Answer:

B. surveys that employ randomly dialed cell phone numbers