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An article entitled "The Science of Polling" in Newsweek (Sept. 28, 1992) stated: "Ensuring a random sample also requires something beyond statistics. During Reagan's 1984 re-election campaign, his internal 'tracking' polls showed him well ahead of Mondale - except on Friday nights. 'They went into a panic every week until they figured it out,' says Frank Lutz, a political science professor at the University of Pennsylvania ... The explanation: registered Republicans, on average more flush than their Democratic counterparts, were more likely to go out on the town Friday nights and not be home to answer the pollster's phone call." What errors were the pollsters encountering in their sampling procedure on Fridays?
At the 0.01 level of significance, does the machine appear to be in need of maintenance and calibration? Determine and interpret the p-value for the test.
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
What is the probability that more than 21% of the people in the sample do volunteer work?
Jennifer decided to have a barbecue. She invited John over and offered him a piece of wild boar. Unfortunately, the boar was not cooked all the way through.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Several complaints recently have been sent to the Gotham City police department regarding the increasing incidence of congestion on the city's streets.
In 1866 Richard Baxendale, iron moulder, founded the Baxendale company in northern England. In 1935 the company launched the first product with the Baxi name; it built up a reputation for marketing Baxi boilers. Then, in 1983, the firm was sold as..
questionabc company produces a line of internal winchester disks for pcs. the drives uses a 3.5 inch platter from an
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
Fast Service Truck Lines uses the Ford Super Duty F-750 exclusively. Management made a study of the maintenance costs and determined the number of miles traveled during the year followed the normal distribution. The mean of the distribution was 60..
A professor wants to use the mean of a random sample to estimate the average amount of time students take to do their homework.
The manager believes that the interactions B× C and B × E are important. Show an experimental design using an orthogonal array that can estimate these effects.
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