STATS:DATA+MODELS-W/DVD
4th Edition
ISBN: 9780321986498
Author: DeVeaux
Publisher: PEARSON
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Chapter 15, Problem 25E
To determine
Find the expected number of appearance defected in a new car and the standard deviation.
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In a survey of 2727 adults, 1463 say they have started paying bills online in the last year.
Construct a 99% confidence interval for the population proportion. Interpret the results.
A 99% confidence interval for the population proportion is
(Round to three decimal places as needed.)
Interpret your results. Choose the correct answer below.
(D).
A. With 99% confidence, it can be said that the population proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence
interval.
B. With 99% confidence, it can be said that the sample proportion of adults who say they have started paying bills online in the last year is between the endpoints of the given confidence
interval.
○ C. The endpoints of the given confidence interval show that adults pay bills online 99% of the time.
A research center claims that at least 28% of adults in a certain country think that their taxes will be audited. In a random sample of 600 adults in that country in a recent year, 25% say they are
concerned that their taxes will be audited. At a = 0.10, is there enough evidence to reject the center's claim? Complete parts (a) through (d) below.
...
(a) Identify the claim and state Ho and Ha.
Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice.
(Type an integer or a decimal. Do not round.)
A. At least
B. Less than
% of adults in the country think that their taxes will be audited.
% of adults in the country think that their taxes will be audited.
C. The percentage of adults in the country who think that their taxes will be audited is not %.
D.
% of adults in the country think that their taxes will be audited.
Let p be the population proportion of successes, where a success is an adult in the country who thinks that…
The table shows the total square footage (in billions) of retailing space at shopping centers and their sales (in billions of dollars) for 10 years. Construct a 90% prediction interval for sales when the
total square footage is 5.7 billion. The equation of the regression line is y = 567.939x - 1985.560.
Total
4.9 5.2 5.3 5.4
5.5
5.6
5.9
5.9 5.9 6.1
Square Footage, x
Sales, y
880.1 935.5 989.5 1056.9 1100.7 1201.9 1283.4 1346.3 1434.8 1549.5
Click the icon to view a table of critical values for the t-distribution.
Construct a 90% prediction interval for the sales when the total square footage is 5.7 billion. Choose the correct prediction interval below, rounded to the nearest million dollars.
Chapter 15 Solutions
STATS:DATA+MODELS-W/DVD
Ch. 15.1 - 1. One of the authors took his minivan in for...Ch. 15.3 - 2. Suppose the time it takes a customer to get and...Ch. 15 - Prob. 1ECh. 15 - 2. Caffeinated A coffee shop tracks sales and has...Ch. 15 - 3. Oranges again What is the standard deviation...Ch. 15 - 4. Caffeinated again What is the standard...Ch. 15 - 5. Salary An employer pays a mean salary for a...Ch. 15 - 6. Golf scores A golfer keeps track of his score...Ch. 15 - 13. Battery The life span of a calculator battery...Ch. 15 - 14. Ketchup An automatic filling machine in a...
Ch. 15 - 15. Expected value Find the expected value of each...Ch. 15 - 16. Expected value Find the expected value of each...Ch. 15 - 17. Pick a card, any card You draw a card from a...Ch. 15 - 18. You bet! You roll a fair die. If it comes up a...Ch. 15 - 19. Kids A couple plans to have children until...Ch. 15 - 20. Carnival A carnival game offers a $100 cash...Ch. 15 - 21. Software A small software company bids on two...Ch. 15 - Prob. 16ECh. 15 - Prob. 17ECh. 15 - Prob. 18ECh. 15 - Prob. 19ECh. 15 - 26. The die Find the standard deviation of the...Ch. 15 - Prob. 21ECh. 15 - Prob. 22ECh. 15 - Prob. 23ECh. 15 - 30. Red lights A commuter must pass through five...Ch. 15 - 31. Defects A consumer organization inspecting new...Ch. 15 - 32. Insurance An insurance policy costs $100 and...Ch. 15 - Prob. 27ECh. 15 - Day trading An option to buy a stock is priced at...Ch. 15 - Prob. 29ECh. 15 - 36. Contracts Your company bids for two contracts....Ch. 15 - Prob. 31ECh. 15 - Prob. 32ECh. 15 - Prob. 33ECh. 15 - Prob. 34ECh. 15 - Random variables Given independent random...Ch. 15 - 42. Random variables Given independent random...Ch. 15 - Prob. 37ECh. 15 - 44. Garden A company selling vegetable seeds in...Ch. 15 - Prob. 39ECh. 15 - Stop! Find the mean and standard deviation of the...Ch. 15 - Tickets A delivery company’s trucks occasionally...Ch. 15 - Donations Organizers of a televised fundraiser...Ch. 15 - 49. Fire! An insurance company estimates that it...Ch. 15 - Prob. 45ECh. 15 - 52. Pets The American Veterinary Association...Ch. 15 - Prob. 47ECh. 15 - More pets You’re thinking about getting two dogs...Ch. 15 - 55. Medley In the 4 × 100 medley relay event, four...Ch. 15 - Prob. 50ECh. 15 - Prob. 51ECh. 15 - 58. Bike sale The bicycle shop in Exercise 56 will...Ch. 15 - 59. Coffee and doughnuts At a certain coffee shop,...Ch. 15 - Prob. 54E
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