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About 50% of male internet users aged 18-34 visit an auction site (such as eBay) at least once a month. A random sample of 12 male internet users aged 18-34 is taken. What is the probability that at least 8 of the 12 have visited an auction site in the past month?
The Helsinki heart study asked whether the anticholesterol drug gemfibrozil reduces heart attacks. They gave the drug to 2000 men aged 40-55 and a placebo to another 2000. The probability of a heart attack for men this aged in a 5-year period is 0.04. What are the mean and standard deviation of the number of heart attacks that will be observed in one group if the treatment does not change the probability?
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
The past five months he returns for GIA company are 1.35%, -1.7%, 4.35%, 3.9%, and 2.1%. What is the average monthly return?
suppose a random variable x has density fx c x 3 if x equal or great than 10 else where c is a constant.a what is the
a new student grade balance was checked for stability accurancy by weighinga 100 gram weight five times. the results
Over the last 10 years, the hurdle or discount rate for projects from the firm's research and development division has been 10% twice, 15% three times.
Let Y= 1 if the two coins show the same thing (i.e., both heads or both tails), with Y= 0 otherwise. Let Z = X + Y, and W =XY.
Find the minimum sample size required.- For the sample size found in the previous question, plot the OC curve.
a national manufacturer of unattached garages discovered that the distribution of the lengths of time it takes two
question the events x and y are mutually exclusive. suppose px .05 and py .02. what is the probability of either x or
A randomly selected sample of 400 students is surveyed about whether additional coed dorms should be created at their school. Of those surveyed, 57%.
The probability of passing the exam is 0.4. What is the probability of getting into the exam late and still passing the exam?
What is the upper bounds of the 95% confidence interval for the mean lifetime of the components?
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