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Suppose probability samples of size n=2 are selected from {1, 2, 3, 4} with probabilities d1=.4, d2=.4, d3=.1, and d4=.1. Demonstrate that tau_hat is still an unbiased estimator of the population total, but its variance is 81.25.
What happens to the confidence interval when we go from a 95% confidence level to a 99% confidence level? Is this desirable? When would we want to use a 99% confidence interval?
What proportion of the first 70 digits in the table are 0s (there are 40 digits in line 101 followed by the first 30 in line 102)?
If a random student is chosen what is the probability that he or she scores less than 59? What score indicates that the student has to retake the exam?
Two bonus points for rigorously proving Xt and Xt+1 are not independent. Let Xt=1+et-0.5et-1, t=1,2,3,..., where et~IID N(0,2), variance of et is 2. Calculate the mean of Xt.
any conclusion drawn for the t-test statistical process is only as good as the research question asked and the null
a random sample of 49 statistics examinations was taken. the average score in the sample was 84 with a variance of
The Greenfield Service Company's marketing director is interested in analyzing the relationship between her company's sales and the advertising dollars spent. In the course of her analysis, she selected a random sample of 20 weeks and recorded..
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
The population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades?
Calculate the mean, median, and standard deviation for ounces in the bottles and construct a 95% Confidence Interval for the ounces in the bottles.
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
fitting of multiple linear regression equation.the revenues gained from sales of books from an e-book supplier the book
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