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Question: Give it some gas! Computers in some vehicles calculate various quantities related to performance. One of these is fuel efficiency, or gas mileage, usually expressed as miles per gallon (mpg). For one vehicle equipped in this way, the miles per gallon were recorded each time the gas tank was filled and the computer was then reset. Here are the mpg values for a random sample of 20 of these records:
Construct and interpret a 95% confidence interval for the mean fuel efficiency μ for this vehicle.
A student randomly surveyed n = 36 other students and found that the mean amount of money spent on texts was x‾ = $121.60. If the standard deviation of the population was σ = $6.36, find the 90% confidence interval of the mean.
Find the probability distribution of the sample mean noise level.- Find the probability that the sample mean is less than 60 decibels, the level of moderate conversational speech.
Suppose you want to test the null hypothesis, H0: μ=48, using a sample of n=70 cable shoppers. Find the p-value of a two-tailed test if x=49.1 and s=6.8.
Kolzak Appliance has just received a shipment of 10 TV sets. Shortly after they were received, the manufacturer called to report that he had inadvertently shipped 3 defective sets.
Conduct a test to determine if the mean heat rate of gas turbines augmented with high pressure inlet fogging exceeds 10,000 kJ/kWh. Use α = .05.
Do a complete analysis that includes description of the data and a rank test for the significance of the differences in lengths among the three species.
find the probabality that at most 55 will be defective and find the probability that between 50 and 66 will be defective
What was your percentile score on this test? Using what you know about z scores and percentiles, how did you do on this test?
suppose that replacement times for washing machines have a mean of 9.3 years and a standard deviation of 1.1 years.
Statistics. A manufacturer claims that the mean lifetime of its fluorescent light bulbs is 1500 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 1480 hours with a population standard deviation of 80 hours. Test the manufactur..
Find the value of population mean the mean of the distribution of sample proportions.
Customers arrive into a queue, where they are served, and then depart. We model the time between two successive arrivals by an exponential distribution with an arrival rate l=9.
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