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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?
A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured. Compute the sample standard deviation.
In a randomly controlled trial conducted with children suffering from croup, 46 randomly selected children were treated with ow humidity while another group of randomly selected children were treated with high humidity.
Based on p=.60, probability that a randomly selected homeowners will say no to newspaper subscription.
If true explain and if false give an example. a. The significance level of a statistical test is equal to the probability that the null hypothesis is true. b. If the significance level of a test is decreased, the power of the test would be expected t..
If the observed value is 4, the expected value is 5, and the standard error is 4, then the test value used for the z test is equal to
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Suppose we have the following information from a single regression: What is the coefficient of determination? What is the correlation coefficient?
When the level of confidence and sample standard deviation remain the same, a confidence interval for a population mean based on a sample of n = 100
The scores of students taking the Scholastic Aptitude Test (SAT) are normally distributed with a mean u = 1035 and a standard deviation o = 131.
One approach for defining elevated blood pressure is to use 90 mm Hg- the standard for elevated adult DBP- as the cutoff. What percentage of 17-year-old-boys would be found to have elevated blood pressure, using this approach?
We wish to create this mean value interval for selling price with 95% confidence level. Find out the best point estimate (average) for selling price. Critical t-value(s) associated with 95% confidence level.
What is the probability of either X or Y occurring? What is the probability that neither X nor Y will happen?
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