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Disappearing Internet sites
Internet sites often vanish or move, so that references to them can't be followed. In fact, 13% of Internet sites referenced in papers in major scienti?c journals are lost within two years after publication.8 If a paper contains seven Internet references, what is the probability that all seven are still good two years later? What speci?c assumptions did you make in order to calculate this probability?
What is the weighted mean hourly wage?
a utility company serves 50000 households. as part of a survey of customer attitudes they take a simple random sample
here is data on the age in months that 20 children said their first words of
The distracted group had an average score that was 10 points lower than the average for the control group. Explain why it is important that the researchers created the two experimental groups in this study by using random assignment.
in san francisco 30 of workers take public transportation daily usa today december 212005.in a sample of 9 workers what
the mean per capita income is 17635 dollars per annum with a standard deviation of 891. what is the probability that
If the F test indicates significant differences at the 0.05 significance level, apply Tukey's HSD to see if there is a slugger who stands out with the lowest average. Is there a slugger with an average significantly higher than the rest? Is Bonds ..
Let X 1 , X 2 , ... , X n be a random sample from the distribution with probability density function f(x; Θ) = [Θ / 2sqrt(x)] * e^[-Θsqrt(x)], x > 0 , Θ > 0. What is the probability distribution of sigma notation from i = 1 to n (sqrt(Xi))?
A mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be 5 minutes or less?
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
a random sample of 16 csn students is taken. the average age in the sample was 27 years with a standard deviation of 4
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
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