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Historically the average age of European soccer players is reported as 26 years with a standard deviation of 4 years. A random sample of 81 European professional soccer players has an average age of 27 years. We would like to decide if there is enough evidence to establish that average age of European soccer players has increased significantly. What is the decision at ?=.05 and 0.01? Indicate which test you are performing; show the hypotheses, the test statistic and the critical values and mention whether one-tailed or two-tailed.
In general how is the magnitude of the standard error of estimate related to the value of correlation?
The consequences of the central limit theorem is that if we end up averaging the measurements of a particular quantity, the distribution of an average tends on going toward a normal one?
Calculate the mean and standard deviation of the following data sets, then produce a five number summary and box plot of data.
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
Flaws occur in the interior of plastic used for automobiles according to a Poisson distribution with a mean of 0.02 flaws per panel. If 50 panels are inspected, what is the probability that the number of panels that have one or more flaws is less ..
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
The number of defective components produced by a certain process in one day has a Poisson distribution with mean 20. Each defective component has probability 0.6 of being repairable.
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
Why is a normal distribution called "normal"? Investigate the answer to this question on the internet and share the answer in your own words. Be sure to cite your sources.
Citing significant strides in math and science by women of all ethnic backgrounds, the College Broad says that the male-female gap on Scholastic Assessment Test scores continue to narrow among high school students.
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 11.0 points, find the 98% confidence interval of the true mean.
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