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1. Getting angry at other drivers. Refer to Exercise 8.14. The same Pew Poll found that 38% of the respondents "shouted, cursed or made gestures to other drivers" in the last year.
(a) Construct a 95% con?dence interval for the true proportion of U.S. drivers who did these actions in the last year.
(b) Does the fact that the respondent is self- reporting these actions affect the way that you interpret the results? Write a short paragraph explaining your answer.
2. Cheating during a test. A national survey of high school students conducted by the Josephson Institute of Ethics was sent to 37,328 students, and 24,142 were returned. One question asked students if they had cheated during a test in the last school year.14 Of those who returned the survey, 9054 responded that they had cheated at least two times in the last year.
(a) What is the sample proportion of respondents who cheated at least twice?
the mode of a continuous distribution is the value x thatmaximizes fxdoes the uniform distribution with parameters a
If there are no large cost disadvantages, the data suggest that we should proceed. B) Technical issue: Does the treatment effect depend on the past average sales?
the economy may be headed for recession. as the manager of a bank you would like to know the average income of the
In a recent year, 10% of all luxury cars sold were black. If 25cars of that year and type are randomly selected, find the following probabilities.(a) At least five cars are black.
Uniformly distributed in the interval -0.5 cents to 0.5 cents. What is the probability that the round-off error exceeds 0.3 cents or is less than -0.3 cents?
Give the name of the kind of sampling that was most likely used in each of the following cases: a Wall Street Journal poll of 2,000 people to determine the president's approval rating
You are using a significance level of α = 0.05 to test a claim that p > 0.5. Your sample is a simple random sample of size n = 49. Calculate β for the test, assuming that the true population proportion is 0.7 and showing all work.
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a u chart is to be used to control a corrugated paper product line. end product is produced in rolls of varying
Use the mean, median, and mode to make a statement about the difference in performance for city and highway driving.
the manager of the hippon drug store is remodeling his facility and is considering three ways of organizing his
Assume that 80% of the adult population in the United States has tasted either Coke or Pepsi. For a sample of 250 adults, How many would you expect to have tasted either Coke or Pepsi? Whats the variance?
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