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A sample of 3000 observations has a bell-shaped distribution with a mean of 82 and a standard deviation of 16. Using the empirical rule, find what percentage of the observations fall in the intervals x-bar ± 1s, x-bar ± 2s, and x-bar ± 3s.
Between 1951 and 2000, there were 295 hurricanes in the Atlantic Ocean. Assume that the numbers of hurricanes in different years can be accurately modeled as i.i.d. random
the scores on a standardized test had mean of 2.711 and a standard deviation of 1.335. a teacher had 61 students take
we wish to design a study to assess risk factors for stroke and dementia. there are two primary outcome measures. the
Finding appropriate z- and t-scores is important when constructing confidence intervals. Confidence intervals allow one to estimate important population parameters such as population mean, population proportion, population standard deviation, etc. We..
Where is the flaw and how can it be fixed? If R^2 is taken as a model for the Euclidean plane, does this help resolve the difficulty? Explain.
using the information provided indicate which statistical test you think should be used for each of the following
Discuss the issue of statistical power in non-parametric tests (as compared to their parametric counterparts). Which type tends to be more powerful? Why?
Suppose that there are 40 students in a statistics class and their blood type follows the percentage distribution given in Exercise. (a) If we randomly select two students from this class, what is the probability that both will have the same..
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
a trial program is carried out to lower the recidivism rate of convicts that is the rate at which released prisoners
the mean prepartion fee hampr blocked charged retail customers last year was 183 the wall street journal march 72012.
Consider random variables X and Y with a joint pmf, given in the following table. Compute the conditional expectations E[X|Y = 1] and E[X|Y > 1].
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