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What role does sample size play in the accuracy of statistical inference? Why is the method of selecting the sample even more important than the size of the sample?
You are asked to estimate the chance that the sum will be positive.
Determine the minimum sample size he must select if he wants to be 90% confident that the true average time is within 10 minutes of the sample average?
given a sample size of 22 with sample mean 726.2 and sample standard deviation 85.3 we perform the following hypothesis
The diameters of a wooden dowel produced by a new machine are normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inches. What percent of the dowels will have a diameter less than 0.57?
Seniors as to how much they spent on textbooks in that term. The bookstore believes that the two groups spend the same amount. What is the test value?
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments. You are given the results below.
Drawing on one of your interests in the study of criminal justice, develop three hypotheses that can be tested using t-tests. Why do you think it would be interesting or important to test these hypotheses?
A standard deviation of 0.45 miles per gallon, find the probablilty that a car has a gas mileage of between 27.8 and 28.2 miles per gallon.
Explain how hypothesis testing may be applicable in the industry of law. Provide a specific example and set up the null and alternative hypothesis?
The accompanying two histograms represent the distribution of acceptance rates (percent accepted) among 25 business schools in 1995. The histograms use different class intervals, but are based on the same data. In each class interval, the left endpoi..
American food will cause an increase in weights. Use the .01 significance level. A random sample of 11 international students is chosen for the study. What is your conclusion?
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
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