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Question: A political party suspects there are differences in Presidential candidate preferences based on age. A nationwide survey was conducted with 500 registered voters selected at random in each of four age groups (30 & under, 31-50, 51-70, over 70). All survey respondents indicated their preference rankings (1, 2, 3) for the party's three leading candidates. To test differences in voting preferences, a significance level of .05 is desired. What test(s) would you recommend?
What advantage does correlation have over a cross-tab?
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?
A coin is unbalanced such that it comes up tails 55% of the time. In an effort to prove that the coin is unfair, an experimenter flips the coin 50 times.
Calculate the mean and standard deviation of the following data sets, then produce a five number summary and box plot of data.
56% are enrolled in school. If a sample of 500 such children is randomly selected, find the probability that at least 250 will be enrolled in school.
A business journal investigation of the performance and timing of corporate acquisitions discovered that in a random sample of 2,863 firms, 848 announced one or more acquisitions during the year 2000.
Discuss the subject matter in the article, and interpret the results and what the confidence interval and margin of error mean as they apply to the specific subject matter.
what are some of the significant problems that transgender suspects face in the criminal justice system?how have the
Hypothesis test for difference between two population variances - compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean.
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
If it takes 4 hours to cover x miles and 5 hours to cover y miles, what is the average speed?
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