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A public relations agency tells its client that 80% of the residents in a 50-mile radius believe the company is "an industry leader." Skeptical, the company commissions a survey in which just 320 of the 500 persons interviewed felt the company was an industry leader.
If the public relations agency's claim is correct, what is the probability that interviews with 500 people would yield 320 or fewer who felt the company was an industry leader?
Fifty individuals are rated on how open minded they are. The ratings have the values 1, 2, 3, 4 and the corresponding relative frequencies are 0.2, 0.24, 0.4, 0.16, respectively. Compute the mean, variance and standard deviation.
Find a % confidence interval for the difference in average absorption time for the two drugs. Does it appear that one drug is absorbed faster than the other at the % significance level.
Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report,
Is there solid evidence that the earth is getting warming? 69% of 731 male resondents answered yes and 70% of 770 female respondents answered yes.
the number of students who belong to the dance company at each of several randomly selected small universities is shown
The seeds were planted in wet soil, and the number of emerging plants were counted. If the solution was not effective and four plants actually sprouted, what is the probability that all four plants emerged from treated seeds?
The Gallup Poll has decided to increase the size of its random sample of Canadian voters from about 1500 people to 4000 people. The effect of this increase is: increase the standard error of the estimate.
a distribution with a mean of u64 and a standard deviation of4 is being transformed inot a new standarized
Charles Scrab Inc has beginning inventory of $15,000, purchases of $25,000, and ending inventory of $10,000, sales of $75,000, operating expenses of $30,000, and a tax rate of 40% for 2010. An accounting clerk input the ending inventory as $12..
Use a t test to test the claim about the population mean u at the given level of signifiance a using the given sample statistics. For each claim, assume the population is normally distributed.
What is the probability that a student selected at random from anywhere in the school system failed the test?
the following table shows the distribution of blood types in the general populationhoxworth blood center cincinnati
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