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A common belief holds that the larger the population for which an estimate is being made, the larger the sample needs to be. By this logic, consider the statistics regarding the repeal of the U.S. "Don't Ask, Don't Tell" policy prohibiting homosexuals from serving in the military. A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who felt the same way. Is this correct? Why or why not?
The systolic blood pressure of a group of 18-year-old women is basically distributed with a mean of 120 mmHg and a standard deviation of 12 mmHg.
Determine the mode for this distribution. Describe why you can't calculate the mean number of times using data in the table.
Determine the class with the greatest number of data values.
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Which of the given properties doesn't apply to theoretical normal distribution?
Assume the arrival of these emails i3 approximated by the Poisson distribution.
The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and standard deviation of approximately 1 day.
If we select a crew member at random, what is the probability the crew member earns:
Find the mean ______________ and the standard deviation _____________
What would be a good example of a null and alternative hypotheses for a decision relevant in life? What Type I and Type II errors could occur with your decision-making process?
Computing the mean and standard errors of sampling distribution - Using the central limit theorem, find the means and standard errors of sampling distributions
What is the value of the population mean? What is the best estimate of this value?
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