Data Collection and Sampling Methods

This video tutorial covers the basics of data collection, distinguishing between populations and samples, and categorizing data as qualitative or quantitative. It explains sampling methods, potential biases in studies, and differentiates between observational studies and experiments. The tutorial includes examples to illustrate these concepts, such as a political survey and a controlled experiment on an HPV vaccine. It also discusses various types of bias and sampling methods, including random, stratified, and cluster sampling.

What is the population in a study where a political scientist surveys 32 out of 106 representatives?

• All representatives in the state's congress

• The 32 representatives surveyed

• All voters in the state

• The 18 representatives supporting the bill

What is a census in the context of data collection?

• A survey of the entire population

• A survey of a specific subgroup

• A survey of a sample of the population

• A survey of volunteers

Which of the following is an example of a loaded question?

• What is your favorite color?

• Should the mall prohibit loud and annoying music?

• How often do you exercise?

• What is your age?

How would you classify data that involves letter grades from A to F?

• Experimental data

• Numerical data

• Qualitative data

• Quantitative data

What type of study involves measuring the temperature on randomly selected days?

• Survey

• Controlled experiment

• Experiment

• Observational study

In stratified sampling, how is the sample chosen?

• By selecting volunteers

• By choosing the most convenient members

• By selecting every nth member

• By dividing the population into subgroups and sampling each subgroup

Which sampling method involves selecting a set of subgroups to be in the sample?

• Systematic sampling

• Cluster sampling

• Convenience sampling

• Stratified sampling

In an experiment, what is the group called that receives the treatment being tested?

• Comparison group

• Treatment group

• Control group

• Placebo group

What is a blind study?

• A study where participants know which group they are in

• A study where neither participants nor researchers know the group assignments

• A study where only the researchers know the group assignments

• A study where participants do not know whether they are receiving the treatment or placebo

What is the placebo effect?

• The effect of a treatment being compared to a control group

• The effect of a treatment being influenced by the patient's perception

• The effect of a treatment being measured accurately

• The effect of a treatment being influenced by the researcher's bias