STA Week 2 Individual Work solution correct answers

Question: #6055

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?

(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?

( 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.

Solution: #6056

STA Week 2 Individual Work solution correct answers

STA 2014 Week 2 Individual Work solution correct answers 1.1 Skill Building 22. Number of Siblings The number of siblings would quantitative because an arithmetic operation can be performed. 24. Number on a football player’s jersey The number on a football player’s jersey would be qualitative because the jersey number would be characteristic. 32. Number of sequoia trees in a randomly selected acre of Yosemite National Park Would be a discrete variable because the number of sequoia trees would be countable if one acre is squared off in Yosemite National Park. 34. Internet connection speed in Kilobytes per second The Internet speed in Kilobytes would be continuous because it would have an infinite number of possible values that are not countable. 52. BMW cars the following information relates to the 2008 model year product line of automobiles. Model Body Style Weight (lb) Number of Seats 3 series Coupe 3,351 4 5 Series Sedan 3,505 5 6 Series Convertible 4,277 4 7 Series Sedan 4,486 5 X3 Sport Utility 4,012 5 Z4 Roadster Coupe 3,087 2 This information represents qualitative variable because the information characterizes the cars shown. 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? The research objective was to find out what the long term financial worries are in adults. (b) What is the population? The population is all adults 18 and older. (c) What is the sample? The sample consisted of 1,600 adults (d) List the descriptive statistics. Of the 1,600 adults questioned 18% were worried about having enough money...