STA 2014 Week 2 Individual Work solution correct answers
1.1 Skill Building
22. Number of Siblings
24. Number on a football player’s jersey
32. Number of sequoia trees in a randomly selected acre of Yosemite National Park
34. Internet connection speed in Kilobytes per second
52. BMW cars the following information relates to the 2008 model year product line of automobiles.
58. Financial Worries? Gallup News Service conducted a survey of 1,006 American adult aged 18 years or older. September 24-27, 2007. The respondents were asked, “What, if anything, worries you most about your personal financial situation in the long term?” Of the 1,006 adults surveyed, 18% said they were most worried about having enough money for retirement. (Ironically, not having enough money for retirement was not a short-term concern.) Gallup reported that 18% of all adult Americans were most worried about not having enough money for retirement, with a 4% margin of error with 95% confidence.
(a) What is the research objective?
(b) What is the population?
(c) What is the sample?
(d) List the descriptive statistics.
(e) What can be inferred from the survey?
1.2 Skill Building
14. While shopping, 200 people were asked to perform a taste test in which they drink from two randomly placed, unmarked cups. They are then asked which drink they prefer.
16. Conservation agents netted 250 large-mouth bass in a lake and determined how many were carrying parasites.
1.5 Skill Building
14. The village of Oak Lawn wishes to conduct a study regarding the income level of households within the village. The village manager selects 10 homes in southwest corner of the village and sends an interviewer to the homes to determine household income.
16. Suppose you are conducting a survey regarding the sleeping habits of students. From a list of registered students, you obtain a simple random sample of 150 students. One survey question is “How much sleep do you get?
18. Cold Stone Creamery is considering opening a new store in O’Fallon. Before opening the store, the company would like to know the percentage of households in O ’Fallen that regularly visit an ice cream shop. The market researcher obtains a list of households in O ‘Fallon and randomly selects 150 of them. He mails a questionnaire to the 150 households that ask about ice cream eating habits and flavor preferences. Of the 150 questions mailed 4 are returned.
20. A health teacher wishes to do research on the weight of college students. She obtains the weights for all the students in her 9 A.M. class by looking at their driver’s licenses or state IDs.
1.6 Applying Concepts
12. Pharmacy. A pharmaceutical company has developed an experimental drug meant to relieve symptoms associated with the common cold. The company identifies 300 adult males 25-29 years old who have a common cold and randomly divides them into two groups. Group 1 is given the experimental drug, while group 2 is given placebo. After 1 week of treatment, the proportions of each group that still have cold symptoms are compared.
(A) What is the response variable in this example?
(B) Think of some of the factors in the study. How are they controlled?
(C) What are treatments? How many treatments are there?
( D) How are the factors that are not controlled dealt with?
( E) What type of experimental design is this?
( F) Identify the subjects.
(G) Draw a diagram similar to figure 7, 8, or 10 to illustrate the design.