Question

Samuel is interested in finding out the favorite video game of other students ​at his school.
Explain how an observational study could also be used to answer this ​question

Answer 1

An observational study is appropriate here because you only want to measure students’ preferences (you’re not manipulating anything). You can learn the school’s favorite video games by observing or surveying students without intervening. One clear way to do it:

1. State the goal
- Estimate the distribution of favorite video games among students (overall and maybe by grade or gender).

2. Define the population
- All students at the school (or a subset, e.g., grades 6–8).

3. Choose a sampling method that gives a representative sample
- Simple random sample: draw student names from the school roster.
- Stratified sample: sample proportionally within each grade so each grade is represented.
- Cluster sample: randomly select several homerooms and survey every student in those homerooms.
- Aim for a reasonable sample size to reduce sampling error.

4. Decide how to collect data (observational methods)
- Self-report survey (recommended): anonymous questionnaire (paper or online) asking “What is your favorite video game?” with options plus “Other (please specify).”
- Naturalistic observation (optional): observe which games students bring/play in free time or at a gaming club and record frequencies. (Less reliable for “favorite” because it infers preference from behavior.)
- Ensure consent and follow school policies for surveying minors (parental permission if required, teacher/school approval).

5. Design the survey instrument
- Keep the question neutral and unambiguous. Example: “Which video game is your favorite? (Choose one)” with a list plus “Other — please write the name.”
- Or allow up to three favorites to capture ties: “List up to three games you like most.”
- Include simple demographic items if you want subgroup analysis (grade, age).

6. Reduce bias and errors
- Make the survey anonymous to reduce social-desirability bias.
- Pilot the question with a few students to check clarity.
- Provide the same instructions to all respondents.
- Encourage a high response rate (administer in homeroom, give short time, send reminders) to avoid nonresponse bias.

7. Collect and analyze data
- Tally counts and compute percentages for each game.
- Present top favorites (bar chart or frequency table) and breakdowns by grade or other subgroups.
- Report margin of sampling error if using a probability sample.

8. Report limitations
- Nonresponse, coverage (students absent or without access), and social-desirability bias can affect results.
- Observational studies describe what is true in the sample; they don’t imply cause-and-effect (not needed for this question).

Example brief protocol:
- Get approval from the school office.
- Stratify by grade, randomly select 40 students per grade.
- Send an anonymous online form during class: “Which video game is your favorite? (Choose one; write in if not listed).”
- Collect responses, report top five games and percent support for each.

Using this approach, Samuel can estimate the school’s favorite games reliably without manipulating anything—just by observing and recording students’ reported preferences.