Suppose you wanted to gather a sample of 100 NYU School of Public Health students/faculty/staff to assess whether a healthy vending program indeed improved the nutritional quality of the snacks/drinks.Name one of the probability sampling frames, and briefly describe how you might go about selecting your sample based on this sampling frame.

1:
Consider a healthy vending program within a school or workplace. This type of program involves the inclusion and marketing of only “healthy” snacks and drinks within the school/workplace vending machines. The goal of this program is to improve the nutritional quality of the snacks/drinks consumed by the students and/or employees. You are asked to evaluate the effectiveness of this program.

Describe the conditions under which the following designs would be most appropriate.

Also, for each design, please identify and explain ONE (1) limitation/weakness with respect to internal or external validity

A) Post-program only with retrospective pre-program measure design (i.e., pre-and post-program outcome level is measured at the same time)

B) Post-program only with non-equivalent control group design (e.g., using another school/workplace as a comparison)

2: Suppose you wanted to gather a sample of 100 NYU School of Public Health students/faculty/staff to assess whether a healthy vending program indeed improved the nutritional quality of the snacks/drinks.

Answer each of the following:

⦁ A) Name one of the probability sampling frames, and briefly describe how you might go about selecting your sample based on this sampling frame.

⦁ B) Name one of the non-probability sampling frames, and briefly describe how you might go about selecting your sample based on this sampling frame.

⦁ C) Why might you choose the non-probability sampling approach over the probability sampling approach.

⦁ D) What is one limitation of the non-probability sampling approach?

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