1. To gather data on the amount of money people spend on dining out in a particular city, customers were randomly chosen at various restaurants throughout the city.

This is an example of

a) sample bias

b) measurement bias

c) a reliable sampling technique

d) both (a) & (c)

2. A restaurant leaves surveys (about the food and service at the restaurant) on the tables for customers to fill out after they have finished eating. This is an example of

a) a systematic sample

b) a volunteer response sample

c) a convenience sample

d) a cluster sample

3. To gather high-school students' opinions about school uniforms in a particular region, many students were randomly chosen (and surveyed) in three of the region's high schools. In this case, what sampling technique was used?

a) cluster sampling

b) convenience sampling

c) volunteer response sampling

d) stratified sampling