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The average number of phone calls at a particular phone booth is 6 per hour. If someone arrives immediately ahead of you at that booth, find the probability that you have to wait more than 10 minutes.
A newspaper finds that the mean number of typographical errors per page is five. Find the probability that:
Find the area under the normal distribution curve to the right of z = -1.03.
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
Only 10% of American adults can name the capital of the Czech Republic. On a television game show the three randomly selected contestants are given the question "What is the capital of the Czech Republic?" The probability that none of them will kn..
The population standard deviation for both groups is 6. At α = 0.01, is there a difference in the cholesterol levels between the two groups? Find the 99% confidence interval for the difference of the two means.
In a shipment of 52 vials, only 12 do not have hairline cracks. If you randomly select 2 vials from the shipment, what is the probability that none of the 2 vials have hairline cracks?
How many variables are there in this study? What are the levels of any variables you identified and what hypothesis test would be used to analyze these data? Justify your answer.
He finds their mean weight to be 17.78 ounces with a standard deviation of 0.4 ounces. Are the cereal boxes lighter than they should be? Let α = 0.01.
Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. In the 1950s, the average score on the child manifest anxiety scale was µ=15.1. A sample of n=16 of today's children produces ..
i have been quoted 55 by another site can you beat that
What's The POPULATION of interest to the American company?
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
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