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Give and describe an example of a nominal measurement scale.
Would you conclude that your data set is approximately normal? If so, what percentage of your data values lie:
Our customers expect a call to be completed in 22 minutes. Using the data above, does either of our call centers meet this expectation with an alpha level of 0.05?
Four different paints are advertised as having the same drying time. To check the manufacturer's claims, five samples were tested for each of the paints.
a confidence interval for the price of gasoline from a random sample of 40 gas stations in a region gives the
We select a random sample of college graduates employed full-time and find that the mean of the sample is 36 hours and that the standard deviation is 5 hours.
On which test did he do better compared to the rest of the class?
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
For this purpose, a random sample of 55 plots, each of size 100 square meters, is used. The number of ferromagnetic artifacts for each plot is determined.
In the class, there are 17 females (of whom 8 are freshmen) and 16 males (of whom 7 are freshmen). If one student is selected at random, what is the probability of selecting a freshmen or a female?
Lipitor is a drug used to control cholesterol. In clinical trials of Lipitor, 94 subjects were treated with Lipitor and 270 subjects were given a placebo.
A psychiatrist would like to determine whether a new medication has any effect on psychotic symptoms. A sample of patients is assessed and then placed on drug therapy for 2 weeks. The severity of their symptoms is assessed again at the end of the tre..
What are the advantages and disadvantages of each? Explain how the empirical rule help explain the ways in which the values in a set of numerical data cluster and distribute?
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