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There is a horse race with 12 horses competing. A gambler must rank the 12 horses for first, second, third and fourth place finishing. What is the probability of the ranking of any four horses?
If a pregnancy length is randomly taken from this distribution, what is the probability that the length of that pregnancy is less than 260 days?
A store has determined that 25% of all sales are credit sales. A random sample of 75 sales is selected. What is the probability that the sample proportion will be:
suppose the prelliminary results were as follows group 1 n=310,p=32 and group 2 n=309,p=20 construct a 95% confidence interval for the difference in proportions of patients with new hair growth for the two groups using the given data.
Test the hypothesis that the annual incomes of corporate trainers in areas of more than 500,000 are significantly more than those in areas of less than 100,000.
Passengers using New York's MetroCard system must swipe the card at a rate between 10 and 40 inches per second, or else the card must be re-swiped through the card reader. Research shows that actual swipe rates by subway riders are uniformly distr..
Determine regression equation. Use assets as independent variables. For fund with $400.0 million in sales, determineut five-year rate of return (in percent).
In the 1992 U.S. presidential election, Bill Clinton received 43% of the vote compared to 38% for George H. W. Bush and 19% for Ross Perot. Suppose we had taken a random sample of 100 voters in an exit poll and asked them for whom they had voted.
He randomly samples 45 oil wells throughout the United States and determines the mean output to be 10.7 barrels per day with a standard deviation of 1.3 barrels. Test the researcher's claim at the .025 level of significance.
Sample of 36 packages reveals mean weight to be 3.01 pounds, with standard deviation of 0.03 pounds. What is the estimated population mean?
Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample w..
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
You have two unbiased estimates, e 1 and e 2 , of a quantity with variances V 1 and V 2 respectively, and covariance Cov {e1,e 2 } = C. Form a new unbiased estimate:
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