Chapter 11: Q.40 (page 657)
Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade in the region corresponding to the p-value.
Short Answer
The graph:
Chapter 11: Q.40 (page 657)
Graph the situation. Label and scale the horizontal axis. Mark the mean and test statistic. Shade in the region corresponding to the p-value.
The graph:
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Get started for freeYou want to buy a specific computer. A sales representative of the manufacturer claims that retail stores sell this computer at an average price of with a very narrow standard deviation of . You find a website that has a price comparison for the same computer at a series of stores as follows: . Can you argue that pricing has a larger standard deviation than claimed by the manufacturer? Use the significance level. As a potential buyer, what would be the practical conclusion from your analysis?
A sample standard deviation of minutes is the same as a sample variance of __________ minutes.
The average waiting time in a doctor’s office varies. The standard deviation of waiting times in a doctor’s office is minutes. A random sample of patients in the doctor’s office has a standard deviation of waiting times of minutes. One doctor believes the variance of waiting times is greater than originally thought.
What type of test should be used?
Airline companies are interested in the consistency of the number of babies on each flight, so that they have adequate safety equipment. They are also interested in the variation of the number of babies. Suppose that an airline executive believes the average number of babies on flights is six with a variance of nine at most. The airline conducts a survey. The results of the flights surveyed give a sample average of with a sample standard deviation of . Conduct a hypothesis test of the airline executive’s belief.
The expected percentage of the number of pets students have in their homes is distributed (this is the given distribution for the student population of the United States) as in Table 11.12.
A random sample of students from the Eastern United States resulted in the data in Table 11.13.
At the significance level, does it appear that the distribution “number of pets” of students in the Eastern United States is different from the distribution for the United States student population as a whole? What is the p-value?
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