Sampling type: Random, systematic, convenience, stratified or cluster?
1-4 page 31 number 13: (link to answer)
Every 5
th driver is stopped and interviewed.
Systematic sampling. see figure 1-5 page 28
1-4 page 31 number 17: (link to answer)
All waiters and waitresses from each of 20 randomly selected restaurants are interviewed.
Cluster sampling. see figure 1-5 page 28
1-4 page 31 number 19: (link to answer)
The members of this class are surveyed by me to find out number of siblings.
Conveniance sampling. see figure 1-5 page 28