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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
Suppose that, on average, in every two pages of a book there is one typographical error, and that the number of typographical errors on a single page of the book is a Poisson r.v. with λ = 1/2. What is the probability of at least one error on a ce..
if ho b1 0 is not rejected what is the best estimate for the value of the response variable for any value of the
a consumer watchdog organization is concerned about credit card debt. a survey of 10 young adults with credit card debt
An order for 5 pizzas has just been place. What is the minimum number of pizzas that must be made in order to be at least 99% sure that there will be 5 that are edible?
How to identify the subjects who are closest to the cutoff for the upper 2.5% and 5% of the scores and the lower 2.5% and 5% of the scores when looking at the z-scores?
If 9 measurements are randomly selected from this population, what is the probability that the sample mean will exceed 104?
in a study of facial behavior people in a control group are times for eye contact in a 5-minute period. their times are
let x denote a geometric random variable with parameter p. for s gt0 compute ee-sx. for what other values of s is your
a fair ten-sided die is rolled once. event a is the event that a number less than 7 is rolled. event b is the event
During a 36 year period, lightening killed 2768 people in the US. Assume that this rate holds true today and is constant throughout the year. Find the probability that tomorrow.
a researcher conducted a study on the effects of stress on migraines. the researcher computed the number of migraines
the pmf of the amount of memory x gb in a purchased flash drive is given as the
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