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A company conducts random drug tests each month; employee selections are independent of any previous months' selections. If the company tests 30% of its employees each month, what proportion of employees were (a) tested every time in three months, and (b) tested at least once in three months?
in a study of 1000 two parent families a researcher found the mean height of the husbands was 68 inches with a standard
What is the sampling distribution of sample means? What is the mean of the sampling distribution of sample means?
using a normal curve table give the percentages of scores between the mean and a z-score ofa 0.56b 0.57c 1.46d 1.56e
Find the test statistic value for testing the equality of proportion variances.
The residuals for Alaska in the original regression is above 50. Explain why it is not generally informative to judge the unusualness of an observation purely by the magnitude of its residual?
Create a 90% confidence interval for true mean amount of cholesterol in chicken eggs.
There are predictable stages through which every critical thinker must pass. Under what circumstances might one regress from one stage to a previous one?
Give an example of a polynomial of a degree 2 that satisfies the following two conditions: (1) the coefficient of x^2 is 1 and (2) the polynomial cannot be factored. Explain why the polynomial cannot be factored.
Romance USA present reported that 11 percent of all books sold are of the romance genre. If a local bookstore sells 316 books on a given day
Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
Do you think they can be solved explicitly? Take the derivative of the gamma distribution and set it equal to zero and solve for alpha and beta to find the mle?
the following table shows part of the probability distribution for a random variable x.x fx0 0.21 ?2 0.153 ?4 0.15a.
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