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A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.
We have been informed that the stock has gone up 20%. What is the probability of a rise or fall in the GDP?
Describe how multiple correlation and/or regression analysis is (or could be) applied in your work or life environments. Define the dependent and independent variables.
Find the probability of a type I error α if the true proportion is p=0.6.
Picking numbers at random I pick two numbers uniformly at random from {1; 2; : : : ; 6n}, with replacement. What is the probability that both numbers choose are divisible by 2?
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
At.01 significance level, is there relationship between job pressure and age?
Assuming that the dogs did better than what would be expected with random guessing, did they do well enough to be used for actual medical diagnoses? Why or why not?
According to the Internal Revenue Service, the mean tax refund for the year 2007 was $ 2,708. Assume the standard deviation is $ 650 and tha the amounts refunded follow a normal probability distribution.
In a random sample of 26 people, the mean number of books they had read in the past year was 14.93 books and the standard deviation was 16.60 books.
Find the area under the normal distribution curve to the right of z = -1.03.
Which are likely to be independent events? For those you think are not, suggest reasons why.
What is the difference between statistical significance and practical significance? Why is statistical significance not necessarily of practical important difference to a business decision?
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