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Ace Car Rental has three main models that are used in it midsize range of cars. The cars are very similar and perform at about the same level. Since the customer has to pay for the gas use during the rental period, the manager is often asked about which car gets the best gas mileage. To be able to address this question, an analysis was done of the three makes of cars. Each car can use any one of four different grades of gasoline. The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
Gasoline Model A Model B Model CRegular 21.4 22.3 20.8Super Regular 20.6 17.1 19.5Unleaded 21.3 19.2 20.2Premium 20.5 20.3 18.5
A. F = 5.67, there is a significant difference between models.B. F = 6.54, there is a significant difference between models.C. F = 2.41, there is not a significant difference between models.D. F = 1.39, there is not a significant difference between models.
For the data shown below, prepare a x-bar chart. Note that the sample size is three. Record the values for the UCL, center line, and LCL. In addition, note any points that are out of control.
Define the experiment and describe one sample point. Assume that you need to describe only the two jurors chosen and not the order in which they were selected. List the sample space associated with the experiment.
Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
Now consider the real numbers. In fact, lets narrow our focus way down to just the part of the real line between 0 and 1. Circle that part of the real line. How many real numbers are there in between 0 and 1? What can you conclude from all this?
The distribution of SAT scores is normal with a m=500 and a standard deviation of o=100. What SAT scores (X values) separate
A sample of 49 provides a sample mean of 38 and a sample standard deviation of 7. Determine the standard error of the mean.
The scores of the GRE exam are transformed so they have a mean of 500 and standard deviation of 100. The scores are known to be normally distributed. What is the percentage of students that score below 750?
Critically discuss the concept of the normal distribution, why it is important, and what you think it means. When students talk about "grading on the curve," how does that apply to the normal distribution?
A company has been using the same advertising strategy for a number of years and over that time has had relatively constant monthly sales.
Use the Internet or other resources to collect both primary and secondary data regarding the research issue, opportunity, or problem you selected for your Research Process Outline during Week Two.
Your population mean has always been 9 customers per hour. The sample standard deviation is 4. The sample size is 25. The sample mean is 8.
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. What is the new speed limit based on this criterion? In what way do you think the actual distribution of speeds differs from a normal distribu..
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