Understanding Random Sampling

What is the primary goal of random sampling?

• To obtain truthful information about a larger population

• To find the largest possible sample

• To focus only on a specific group

• To ensure every individual is surveyed

Which of the following is NOT a suitable method for ensuring a sample is from the target population?

• Using an online survey tool that identifies respondents' ages

• Conducting interviews with high school students

• Randomly selecting people from a phone book

• Surveying teens in a school cafeteria

Why might interviewing teens in the cereal aisle of a grocery store introduce bias?

• Cereal aisles are not accessible to all teens

• Teens in the cereal aisle might prefer cereal over eggs

• Only a small number of teens visit grocery stores

• The grocery store is too noisy for interviews

What is a potential issue with interviewing athletes on a team whose coach emphasizes protein loading?

• Athletes are too busy to answer surveys

• The sample may be biased towards those who eat eggs

• Athletes do not represent the general teen population

• The coach might influence their responses

Which method is likely to provide a more unbiased sample?

• Surveying teens in a health food store

• Handing out questionnaires randomly to students entering a high school

• Conducting interviews at a local gym

• Interviewing teens in a specific sports team