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Read all of the study questions.  Select one question from each group of questions to answer.  Type the answer in the box below.

1. POPULATIONS AND SAMPLES

   1. Define target population and give an example.
   2. Probability sampling uses random selection. Define random and define probability sampling.
   3. Summarize the advantages of simple random sampling.

   4. Describe systematic random sampling.
      

   5. What is the major disadvantage of non probability sampling?
   6. Contrast a longitudinal study and a cross-sectional study. Give an example of each.
   7. A cohort study is a longitudinal study. What present cohort has been studied more than any other group?

   8. List factors that will be considered when a researcher determines sample size for a study.
      

2. MEASUREMENT AND COLLECTION OF DATA

   1. Discuss the following levels of measurement and give an example of each.
      1. Nominal
      2. Ordinal
      3. Interval
      4. Ratio
   2. List the 5 important questions the researcher will ask regarding the data collection process.
   3. Why is it often advisable to conduct a pilot study before conducting the research study.
   4. What is meant by the reliability of a research instrument?(stability, equivalence, internal consistency)
   5. Define the following types of validity.
      1. Face
      2. Content
      3. Concurrent/predictive
      4. Construct

3. DATA-COLLECTION METHODS

   1. What are some factors to consider when constructing a questionnaire?
   2. Compose a cover letter using the criteria on page 218 of the text. Use the same topic, purpose as you used in the previous exercises in part 2.
   3. Would you rather complete a questionnaire or be interviewed for a research project? State your rationale.
   4. What is the difference between a Semantic Differential Scale and a Visual Analog Scale?