Practice Case Brief 1

A marketing research company is estimating which of the two soft drinks US college students prefer. A random sample of 157 college students at CSUSM produced 30 who preferred soft drink A.

1.What is the research question?

a.Which of the two soft drinks do US college students prefer?

2.What research design makes the most sense for this research?

a.A descriptive research design makes the most sense for this research.

2b. Summarize the sample and the population.

2c. What type of sampling procedure do you think the researchers used?

3.What level of measurement will allow the type of analysis needed to answer this question?

4.What type of scale(s) should the researchers put on the questionnaire?

5.Draw an example.

6.What construct is being studied?

7.Find the 90% confidence interval for the proportions of college students who prefer drink A.

8.With 90% confidence, did they collect an adequate number of students to keep their margin of error at 5%? How about with 95% confidence?

9.They took another sample of 200 students at UCSD and 45% preferred brand B. Based on the two samples, what how will you answer the CEO of soft drink A's question; "Should we invest in R&D to improve our soft drink or not?"