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The Ohio Department of Agriculture tested 203 fuel samples across the state in 1999 for accuracy of the reported octane level. For premium grade, 14 out of 105 samples failed (They didn't meet ASTM specifications and the FTC Octane posting rule). Therefore, how many samples would be needed to create a 99% confidence interval that within 0.02 of the true proportion of premium grade fuel-quality failures?
We are interested in determining whether or not the opinions of the individuals (as to Yes, No, and No Opinion) are uniformly distributed.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
What probability distribution does n1 alone have? Specify the values of the sample size index and parameter for that distribution.
The following ANOVA summary data are the result of a regression with sales per year (dependent variable) as a function of promotion expenditures per year (independent variable) for a toy company.
How many ways can she choose 4 dissimilar rides if order does not matter? If she has chosen the first weeks rides, how many ways can she choose four more different rides for second week? Suppose that order does not matter.
Compare these with the percentages specified by Tchebysheff's Theorem.
Choose the correct answer using sum of squared error (SSE).
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Conduct the following test using 95% level of confidence.
An education expert is researching teaching methods and wishes to interview teachers from a particular school district. She randomly selects ten schools from the district and interviews all of the teachers at the selected schools.
Determine whether the description corresponds to an observational study or an experiment. Thirty university students are divided into two groups, one group receives free tutoring in mathematics, the other does not.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
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