Classify each of the following methods of sampling as: convenience sample, simple random sample,

systematic sample, stratified sample, cluster sample, or a census: (1 pt each) a) The state department of transportation evaluates the quality of a highway by testing core samples

collected every two miles along the highway ________________

b) A college conducts a study of campus safety by randomly selecting 150 members from each of the following groups: resident students, commuting students, and staff. ________________

c) A survey regarding download time on a certain Web site is administered on the Internet by a market research firm to anyone who would like to take it._________