1. Explain in your own words what it means that a sample should be representative of the population.

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

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

4. Mention the difference between a finite and an infinite population.

5. Statistical methods are governed by data. We usually get data from two (2) different sources: observational studies and experiments. What is the difference between an observational study and an experiment?

6. Determine whether the description given corresponds to an observational study or an experiment: Patricia Ramos, 11 years old, became the author of an article in the Journal of the American Medical Association, after testing professional contact therapists. Using a cardboard divider, she placed her hand on top of the therapist's hand, who had to identify the hand Patricia had chosen (Triola, 2013). explain

7. Identify the type of observational study (transveral , retrospective, or prospective) and explain why your selection was made: A group of doctors 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).

8. The company Puertorican publicity has commissioned you to conduct a survey of 100 student users of its Spanish book. Describes the procedures for obtaining a random sample.