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What is the difference between a z-test and a t-test? When estimating population mean, how would you determine the optimal sample size when the maximum error limit is known; however, population variance is unknown and your initial sample size is less than 30? Provide a numerical example.
We want to test the hypothesis that the population variances are equal.
Consumers reported on average 1.7 problems per vehicle with a popular make and model of a 2006 car. We randomly select a vehicle of the same make, model, and year.
Assume that the result is a sample size beyond what you can obtain. Use the compromise function to compute alpha and beta for a sample approximately half the size.
Suppose 40% of a student population possess works part-time. If a random sample of size 300 is drawn from the population, what is the probability that 44% or fewer of the samples works part-time?
Compute the relative dispersion of each group using the coefficient of variation. Comment on the difference in relative dispersion.
A health magazine presented results of a recent study that analyzed data collected by the U.S. Census Bureau in 2000. Results reveal that for both men and women in the United States, heart disease remains the number one killer, victimizing 500,000..
It is very difficult for small businesses to be successful. The Small business administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses is selected. (show work) (a) What is the mean and ..
Determine the probability that we would reject null hypothesis given that it is true?
Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 7.3? Explain.
A sample of 23 European countries found that variance of life expectancy was 7.3 years. Determine the 95% confidence interval estimate for variance of life expectancy in Europe?
The following table is based on information taken from the Medical Practice Characteristics section of the Statistical Abstract of the United States
Given the variances of the two samples below, find the test value and the degrees of freedom that should be used in an F test.
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