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With reference to Exercise 38, what can we say with 99% confidence about the maximum error if we use the observed sample proportion as an estimate of the proportion of all shoppers in the population sampled who use coupons?
Exercise 38
A sample survey at a supermarket showed that 204 of 300 shoppers regularly use coupons. Use the large sample confidence-interval formula of Theorem 6 to construct a 95% confidence interval for the corresponding true proportion.
in the previous exercise suppose that the mean of the filling operation can be adjusted easily but the standard
The probability that a bearing fails during the first month of use is 0.12. What is the probability that it does not fail during the first month? An die (six faces) has the number 1 painted on three of its faces, the number 2 painted on two o..
George Fastrack, head of the Bureau of Obfuscation's United Way drive, wants to know the average United Way pledge among Obfuscation Bureau employees. What is George's best estimate of the mean donation
Write a 700- to 1,050-word executive memo that explains the required reporting for defined contribution, defined benefit, and other postretirement plans. Also include an explanation of what must happen for the two segments to be eliminated.
If the variability of the filling machine is reduced to 0.025 ounce, verify that this will lower the required average amount of coffee to 4.050 ounces and yet keep 98 percent of the jars above 4 ounces.
She obtains a random sample of 34 students who do not plan to take a tutor and a random sample of 38 students who do plan to take a tutor and obtains the following results.
Catalog spending. This realistic modeling project requires much more time than a typical exercise. Table 28.16 shows catalog-spending data for the first 9 of 200 randomly selected individuals from a very large (over 20,000 households) data base.18
A common error is neglecting to get ranked data for some statistical processes. Why do we have to have ranked data? Give an example of where you would need ranked data.
Suppose that the distribution of the body mass index for men has a standard deviation of s = 3 kg/m 2 , and we wish to estimate the mean m using a sample of size n = 49. Find the probability that we would be correct within 1 kg/m 2 .
a confidence interval for the price of gasoline from a random sample of 40 gas stations in a region gives the
According to BusinessWeek, many Japanese consider their cell phones toys rather than tools.14 If a random sample of 200 Japanese cell phone owners reveals that 80 of them consider their device a toy, calculate a 90% con?dence interval for the pop..
the nypd precincts in manhattan are numbered from 1 to 34. if the variable precinct is included in a dataset about
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