## Step 2: Design a study and collect data

Briefly summarize the data collection process.

- Identify the observational units and sample size in this study.
- Describe the explanatory variable and the response variable (as set up in the research conjecture) and classify each as quantitative or categorical.
- Is this an observational study or a randomized experiment? Justify your answer.
- Briefly describe the sample used in the study.
- In particular, was this a random sample selected from a larger population?