Exploring Statistical Studies and Sampling Methods

What is the essential question addressed in this lesson?

• How to conduct a survey

• How to write a research paper

• How to choose the best type of study and sample

• How to analyze data

Which type of study involves asking every member of the sample the same set of questions?

• Case study

• Sample survey

• Observational study

• Experiment

In an experiment, what is applied to some groups to measure its effects?

• A treatment

• A survey

• An observation

• A questionnaire

Which type of study involves observing members of a sample without affecting them?

• Clinical trial

• Experiment

• Observational study

• Sample survey

Why might surveying people on a sunny Saturday afternoon introduce bias?

• People are more likely to be busy

• People are more likely to be indoors

• People are generally happier on sunny days

• People are less likely to answer questions

What is the risk of bias in a study where students are randomly selected to measure their height?

• High risk of bias

• Low risk of bias

• Moderate risk of bias

• No risk of bias

Which sampling method involves dividing the population into groups with similar characteristics and randomly choosing a sample from each group?

• Cluster sampling

• Convenience sampling

• Stratified sampling

• Systematic sampling

What is a potential issue with self-selected sampling?

• It is time-consuming

• It requires a large sample size

• It is expensive

• It is likely to be biased

In a controlled experiment, what is the purpose of the control group?

• To receive the treatment

• To provide a baseline for comparison

• To observe the effects of the treatment

• To ensure randomization

Why is randomization important in a controlled experiment?

• To simplify data analysis

• To increase the sample size

• To eliminate bias

• To ensure the treatment is effective