Critical thinking and sample data collection Instructions: In this task, various types of sampling are described. Solve them according to the instructions provided for each.

Part I- Population

Explain in yur own words what it means that a sample must be representative of the population.

Part II

Explain what are the advantages of using a sample instead of using the population when conducting a statistical study.

Part III

Explain the possible errors that can be made when using a sample.

Part IV- Finite and infinite population

State the difference between a finite population and an infinite population.

Part V

Statistical methods are data driven. We typically obtain data from two (2) different sources: observational studies and experiments. What is the difference between an observational study and an experiment?

Part VI (Triola, 2013 p. 34-35)

Determine if the given description is from an observational study or an experiment: Patricia Ramos, age 11, became the author of an article in the Journal of the American Medical Association after putting professional touch therapists to the test . Using a cardboard divider, she placed her hand on top of the therapist's hand, who had to identify the hand that Patricia had chosen (Triola, 2013).

Part VII (Triola, 2013 p. 36)

Identify the type of observational study (cross-sectional, retrospective, or prospective) and explain the reason for your selection: A group of physicians studied New York City residents with and without respiratory problems. They went back in time to determine how involved they were in the New York City terrorist attacks on September 11, 2001 (Triola, 2013).

Part VIII

The Puerto Rican Publications company has commissioned you to conduct a survey of 100 student users of its Spanish book. Describe the procedures for obtaining a random sample.