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1. More on con?dence level and interval width. Refer to Exercise 8.19. Would a 99% con?dence interval be wider or narrower than the one that you found in that exercise? Verify your results by computing the interval.
2. Can we use the z test? In each of the following cases state whether or not the Normal approximation to the binomial should be used for a signi?cance test on the population proportion p.
(a) n = 30 and H0: p = 0.2.
(b) n = 30 and H0: p = 0.6.
(c) n = 100 and H0: p = 0.5.
(d) n = 200 and H0: p = 0.01.
The best estimator or appreciative for the population proportion is 0.45. How large must the sample be?
A sample of parts provided the following contingency table data on part quality by production shift. Use α =.05 to determine whether part quality is independent of the production shift. What is your conclusion?
a manufacturer of cordless electric shavers sampled 13 from a days production and found the mean time of continuous
i. suppose an influenza epidemic strikes a city. in 10 of families the mother has influenza in 10 of families the
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Use a 0.05 significance level to test the claim that the heights of female supermodels vary less than the heights of women in general. The standard deviation of heights of the population of women is 2.5 in.
construct a 98 two-sided confidence interval on the true standard deviation of the student height distribution.to earn
1. What is the probability that at least one of the bonds defaults? 2. What is the probability that neither the seven-year AA-rated bond nor the seven-year A-rated bond defaults?
The breaking strengths of cables produced by a certain manufacturer have a standard deviation of 96 pounds. A random sample of 50 newly manufactured cables has a mean breaking strength of 1950 pounds.
the average hourly wage of workers at a car wash is 6.50hr. assume the wages are normally distributed with a
A firm engaged in manufacturing undergarments for gents employs 100 male and 144 female workers. The average production per day of a male worker is 60 items with a variance of 15 items, and that of a female workers is 65 items with a variance of 1..
Budgets play a critical role in management activities such as planning, controlling and motivating employees. Used effectively, budgets can help a company achieve its goals and create a productive work environment.
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