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Many airlines ?ying overseas have recently considered changing the kinds of goods they sell at their in-?ight duty-free services. Swiss, for example, is considering selling watches instead of the usual liquor and cigarettes. A Swiss executive believes that there is a 0.60 chance that passengers would prefer these goods to the usual items and that revenues from in-?ight sales would increase by $500,000 over a period of several years. She believes there is a 0.40 chance that revenues would decrease by $700,000, which would happen should people not buy the watches and instead desire the usual items. Testing the new idea on actual ?ights would cost $60,000, and the results would have a 0.85 probability of correctly detecting the state of nature. What should Swiss do?
Computing relative frequencies in a contingency table and a survey of a sample of 347 people is conducted. The survey's respondents are classified according to their political affiliation and their opinion on a bill.
identify the types of samples- systematic cluster convenience random stratified1. a sample was taken of every 49th
An analysis of 1,000 cellular phone calls made from company phones at the offices of Kant, Taekitini, Moore, LLC reveals that the length of these calls is normally distributed, with m = 240 seconds and s = 40 seconds.
A simple regression model has been developed using a sample of 11 pairs of observations. The sum of squares of error is 237.64. The standard error of the estimate is:
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
In a certain city, 50 percent of the people consider themselves conservative (C), 25 percent consider themselves liberal (L), and 25 percent consider themselves to be independent (I).
From the given probability distribution finite the mean and standard deviation.
mcneese and klein 1991 looked at the average particle size. specifications give the standard deviation of 2 microns. a
How many dieters must be surveyed if we want to be 95% confident that the sample mean weight loss is within 0.25 pound of the true population mean? Assume that the population standard deviation is known to be 10.6 lb.
Salaries upon graduating than are graduates of other programs. Describe a statistical experiment that could help test your belief.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
A certain airplane has two independent alternators to provide electrical power.
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