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Use random sampling of clusters to estimate the mean or total of a population of your choice. In the process of carrying out the survey and making the estimate, think about or discuss with others the following:
(a) What practical problems arise in establishing a frame, such as a map or list of units, from which to select the sample?
(b) How is the sample selection actually carried out? (c) What special problems arise in observing the units selected?
(d) Estimate the population mean or total.
(e) Estimate the variance of the estimator above.
(f) Give a 95% confidence interval for the population mean or total.
(g) How would you improve the survey procedure if you were to do it again?
Queen's School of Business in Kingston, Ontario requires a minimum LSAT score of 157 for admission. What is the z-score for a score of 157? Round to three decimal places.a
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For each of the two groups, boys and girls, choose the lowest age group as the baseline and calculate the odds ratio associated with each age group.
A bank manager has developed a new system to reduce the time customers spend waiting for teller service during peak hours. The manager hopes that the new system will reduce waiting times from the current 9 to 10 minutes to less than 6 minutes.
Can one conclude at a level of significance of .01 that the new ball has improved his game?
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When comparing the mean annual incomes for executives with a High School education or less and Undergraduate Degree, the 95% confidence interval shows an interval of 11.7 to 42.7 for the difference. This result indicates that
Use a significance level to test the claim that the mean weight loss is greater than 0. Based on these results does the diet appear to be effective. Does the diet appear to have practical significance.
Spanish a 3 credit hour course. If 4 grade points are assigned for an A, 3 for a B and 2 for a C, what is the weighted mean for the semester grades?
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