research methods course need to read the attached study and answer the questions below

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Please read attached study and answer the following questions.

Study Design:

  1. Describe the sampling plan, including:
    1. Was a probability or nonprobability sample used? State the specific type of probability or nonprobability sampling plan.
    2. Was stratification or clustering used? If so, how was this done?
  2. What sampling frame, if any, was used?
  3. What were the eligibility criteria? Specify both the inclusion and exclusion criteria?
  4. What was the sample size?
  5. What was the response rate?
  6. Was the sampling plan appropriate for this study? Was the study population appropriate in relation to the target population?

Results:

  1. Provide a brief summary of the main findings of this study.
  2. Has the researcher undertaken all relevant analyses?
  3. Is it possible that the association observed between two variables might have been caused by a third, extraneous variable, making the observed relationship spurious?