2.13 Quick review questions

1. Suppose we randomly select a student and send them a postal survey, but the student has moved address and so never receives the survey. What type of bias will this result in?
   Selection bias Response bias Non-response bias
2. What is the main advantage of using a random sample?
   It is easier. It is more likely to produce an internally-valid study. It is more likely to produce an externally-valid study. It is more likely to produce precise estimates.
3. What is the main advantage of using a large sample?
   It is easier. It is more likely to produces an internally-valid study. It is more likely to produces an externally-valid study. It is more likely to produce precise estimates.
4. A large sample is always better than a random sample: True or false?
   TRUE FALSE
5. Suppose I classify a natural forest region into two zones, which are quite different: Region A is mostly dunes and lightly vegetated, and is on the coastal side of a ridge; Region B is more densely vegetated and on the inland side of the ridge. I then take samples of sugar ants (Camponotus app) from each zone to study their size. What is the best description of the type of sampling method being used?
   Simple random sampling Cluster sampling Stratified sampling Multi-stage sampling Voluntary response sampling

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This material was written by Peter K. Dunn and adapted by Amanda J. Shaker. Unless otherwise stated, material within this work is licensed under a Creative Commons Attribution-Non Commercial-Share Alike License CC BY-NC-SA