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Question: The fuel consumption of a certain type of vehicle is approximately normal, with standard deviation 3 miles per gallon. If a sample of 64 vehicles has an average fuel consumption of 16 miles per gallon:
(a) Determine a 95% confidence interval for the mean fuel consumption of all vehicles of this type.
(b) With 95% confidence, what is the possible error if the mean fuel consumption is taken to be 16 miles per gallon?
(c) How large a sample is needed if we wish to be 95% confident that the mean will be within 0.5 miles per gallon of the true mean?
Find the area of the indicated region under the standard normal curve.
Assume that this sample mean was obtained from a random sample of 200 homes in this county, and that the sample standard deviation was $140,000. Give a 95% confidence interval for the average value of a home in Ventura County.
Develop a three-year moving average to forecast sales in year 12. Develop a 3-year weighted average to predict demand in year 12, in which sales in the most recent year is given a weight of 2 and sales in the two years prior to that are each given..
Survey of 16 tax returns reports families with incomes between $75,000 and 100,000 have on average $8,562 in Standard Deductions with the standard deviation of $1,800.
Identify the treatments in this experiment.- Construct a graph that would support a finding of no interaction between the two factors.
The article "Nonbloated Burned Clay Aggregate Concrete" (J. of Materials, 1972: 555-563) reports the following data on 7-day flexural strength of nonbloated burned clay aggregate concrete samples (psi):
The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website, November 2, 2012). Airfares were based on the total ticket value, which consisted of the price charge..
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The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
Political prisoners Mathew, Mark, and Luke are told that two of the three are to be executed. Matthew takes the jailer aside and says, "We both know that at least one of the others, Mark or Luke, will be executed
Using 5% level of significance, is there any difference in proportion of guests who would select the two resorts? What is your conclusion?
a container contains 15 diesel engines. the company chooses 12 engines at random and will not ship the container if any
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