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Suppose that a random sample of 16 observations is drawn from a normal distribution with mean It and standard deviation 12; and that independently another random sample of 25 observations is drawn from a normal distribution with the same mean Il and standard deviation 20. Let X and Y denote · the sample means of the two samples. Evaluate Pr(lX - YI <>
A researcher is investigating whether non-white minorities commit a disproportionate number of homicides. He uses demographic data from Detroit.
List all samples of size 2, and compute the mean of each sample. Compute the mean of the distribution of sample means and the population mean. Compare the two values. Compare the dispersion in the population with that of the sample means.
An insurance company needs to assess the risks associated with providing hurricane insurance. Between 1990 and 2006, Florida was hit by 22 tropical storms or hurricanes. If tropical storms and hurricanes are independent and the mean has not change..
The marketing director of a large department store wants to estimate the average number of customers who enter the store every five minutes.
Among those taking the Graduate Record Exam, 18 people are randomly selected.
I have two contingency tables. One has a chi-square value of 14.40 and the other is 27.86. Both have 6 degrees of freedom. Based on an alpha of .01 do you reject the null hypothesis?
1. The National Center for Health Statistics reports the following age breakdown of deaths in the United States during 2006. Source: The New York Times Almanac 2009, p. 392.
the speed of a runner increased steadily during the first three seconds of a race. her speed at half-second intervals
What is critical z-value which corresponds to confidence level of 88%.
as an occupational health epidemiologist you are required to measure the effect of stress on the workers in your
the annual per capita consumption of ice cream in pounds in the united states can be approximated by a normal
you decide to test the effectiveness using the drug and a placebo. you select a select a group of 500 subjects and
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