Stats
5th Edition
ISBN: 9780135163825
Author: De Veaux, Richard D., Velleman, Paul F., BOCK, David E.
Publisher: Pearson,
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Chapter 10, Problem 16E
a.
To determine
Identify the population of interest for the given study.
b.
To determine
Find the sampling frame of the gallup poll.
b.
To determine
Identify the problem with the sampling frame.
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Customers experiencing technical difficulty with their Internet cable service may call an 800 number for technical support. It takes the technician between 30 seconds and 11 minutes to resolve the problem. The distribution of this support time follows the uniform distribution.
Required:
a. What are the values for a and b in minutes?
Note: Do not round your intermediate calculations. Round your answers to 1 decimal place.
b-1. What is the mean time to resolve the problem?
b-2. What is the standard deviation of the time?
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Exercise 6-6 (Algo) (LO6-3)
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
Admissions
Probability
1,100
0.5
1,400
0.4
1,300
0.1
Click here for the Excel Data File
Required:
What is the expected number of admissions for the fall semester?
Compute the variance and the standard deviation of the number of admissions.
Note: Round your standard deviation to 2 decimal places.
1. Find the mean of the x-values (x-bar)
and the mean of the y-values (y-bar) and write/label each here:
2. Label the second row in the table using proper notation; then, complete the table. In the fifth and sixth
columns, show the 'products' of what you're multiplying, as well as the answers.
X
y
x minus x-bar y minus y-bar (x minus x-bar)(y minus y-bar)
(x minus x-bar)^2
xy
16
20
34
4-2
5 2
3. Write the sums that represents Sxx and Sxy in the table, at the bottom of their respective columns.
4. Find the slope of the Regression line: bi
=
(simplify your answer)
5. Find the y-intercept of the Regression line, and then write the equation of the Regression line.
Show your work. Then, BOX your final answer. Express your line as "y-hat equals...
Chapter 10 Solutions
Stats
Ch. 10.2 - 1. Various claims are often made for surveys. Why...Ch. 10.4 - 2. We need to survey a random sample of the 300...Ch. 10 - Prob. 1ECh. 10 - 2. Satisfied workers The managers of a large...Ch. 10 - Prob. 3ECh. 10 - Prob. 4ECh. 10 - Prob. 5ECh. 10 - 6. Sampling satisfaction A company hoping to...Ch. 10 - Prob. 7ECh. 10 - 8. Satisfactory satisfaction samples For each...
Ch. 10 - Prob. 9ECh. 10 - 10. Happy employees The company plans to have the...Ch. 10 - Prob. 11ECh. 10 - 12. Surveying employees The company of Exercise 2...Ch. 10 - Prob. 13ECh. 10 - 14. Student center survey For their class project,...Ch. 10 - Prob. 15ECh. 10 - Prob. 16ECh. 10 - Prob. 17ECh. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - Prob. 19ECh. 10 - Prob. 20ECh. 10 - Prob. 21ECh. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - Prob. 23ECh. 10 - 24. Mistaken poll A local TV station conducted a...Ch. 10 - Prob. 25ECh. 10 - 26. Parent opinion, part 1 In a large city school...Ch. 10 - Prob. 27ECh. 10 - 28. Churches For your political science class,...Ch. 10 - 29. Playground Some people have been complaining...Ch. 10 - 30. Roller coasters An amusement park has opened a...Ch. 10 - 31. Playground, act two The survey described in...Ch. 10 - 32. Wording the survey Two members of the PTA...Ch. 10 - 33. Banning ephedra An online poll on a website...Ch. 10 - 34. Survey questions Examine each of the following...Ch. 10 - Prob. 35ECh. 10 - 36. Phone surveys Any time we conduct a survey, we...Ch. 10 - 37. Cell phone survey What about drawing a random...Ch. 10 - 39. Fuel economy Occasionally, when I fill my car...Ch. 10 - 40. Accounting Between quarterly audits, a company...Ch. 10 - 41. Happy workers? A manufacturing company employs...Ch. 10 - 42. Quality control Sammy’s Salsa, a small local...Ch. 10 - 43. A fish story Concerned about reports of...Ch. 10 - 44. Another fish story In recent years, beaches...Ch. 10 - 45. Sampling methods Consider each of these...Ch. 10 - 46. More sampling methods Consider each of these...
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