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1. A comparison of the proportion of frequent binge drinkers, revisited. Refer to Exercise 8.46. Redo the exercise in terms of the proportion of nonfrequent binge drinkers in each classi?cation. Explain how you could have obtained these results from the calculations you did in Exercise 8.46.
2. Effects of reducing air pollution. A study that evaluated the effects of a reduction in exposure to traf?c-related air pollutants compared respiratory symptoms of 283 residents of an area with congested streets with 165 residents in a similar area where the congestion was removed because a bypass was constructed. The symptoms of the residents of both areas were evaluated at baseline and again a year after the bypass was completed.24 For the residents of the congested streets, 17 reported that their symptoms of wheezing improved between baseline and one year later, while 35 of the residents of the bypass streets reported improvement.
(a) Find the two sample proportions.
(b) Report the difference in the proportions and the standard error of the difference.
(c) What are the appropriate null and alternative
a) What is the value of the sample proportion p? b) What is the standard error of the sample proportion?
you are a serious student who studies on friday nights but your roommate goes out and has a good time. 40 of the time
A board of directors at the Anchor Pointe Marina is studying the usage of boats among its members. A sample of 30 members who have bots 10 to 20 feet in length showed that they used their boats an average of 11 days last July.
The network is said to be robust if at least one of the three servers operate more than 2 years. What is the probability that the network is robust?
A recent newspaper article reported the results of a survey of well-educated suburban parents. The re- sponses to one question indicated that by age 2, chil- dren were watching an average of µ 5 60 minutes of television each day. Assuming that the..
compute a 95 confidence interval for the population mean based on the sample 1 2 3 4 5 6 and 39. change the number from
At.01 significance level, can we conclude that 30-year mortgage rate for small banks is less than 6%? Evaluate the p-value.
a town has a population of exactly 10000 people.a what is the mean and standard deviation of the number of people
Problem: Two rainstorms occurred in one week in a certain area. In the first storm 30 ml of rain fell per hour, and in the second storm 20 ml of rain fell per hour.
It has been evaluated that 30% of all farms are family-owned. In sample of 12 farms, determine the probability that exactly 3 farms are family owned?
Standard deviation 13. in a random sample of 32 womrn aged 18-24, find the probability that the average systolic blood pressure is between 110 and 120 mm hg.
Calculate the probability that fewer than half of the patients are chain smokers. b) suppose that 20 patients with lung cancer are admitted to the hospital.
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