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Question: Travel and Transportation During a routine commercial airline flight, much of the time in the aircraft is spent waiting to take off and taxiing to an arrival gate. However, airlines also keep careful records of the actual air time of each flight. A random sample of the air times (in minutes) of US Airways flights from Philadelphia to Las Vegas during December 2012 was obtained, and the data are given in the following table.
The air time for this flight is affected by the prevailing west-toeast winds and weather systems and normally takes 303 minutes. Is there any evidence to suggest the true mean air time is greater than this 303 minutes? Assume the underlying distribution is normal and use a = 0.025.
(i) Plot the pdf f (x) for the single large CSTR's residence time distribution and the pdf f (y) for the ensemble of ?ve identical small reactors in series. Determine the mean residence time in each case. (ii) Compute P (Y ≤ 5) and compare wit..
the technology underlying hip replacements has changed as these operations have become more popular. starting in 2003
Between 11 p.m. and midnight on Thursday night, Mystery Pizza gets an average of 5.2 telephone orders per hour.
Suppose X is a vector of IID random variables where each element has some PDF- Find an example PDF such that the median is a better estimate of the mean than the sample mean.
consider rolling two fair dice one green and one red. let r be the random variable which determines the face value of
Various claims are often made for surveys. Why is each of the following claims not correct? It is always better to take a census than to draw a sample.
A confidence level is a percentage of a sample that indicates a certain section or range of data points that can contain a population parameter. The range itself is the confidence interval.
1. the amounts a soft drink machine is designed to dispense for each drink are normally distributed with a mean of 11.6
A local bank wants to install motion detector burglar alarms. Each has a 70% chance of detecting a burglar. If the bank wants to be 99% certain of detecting a burglar how many need to be installed?
In a random sample of 150 sports cars, 60 failed emissions on the first pass. Is there sufficient evidence to indicate that the percentage of first failure for sports cars is higher than the percentage for all passenger cars?
a local pizzeria wants to know how much the average cost of an order is during lunchtime on wednesdays. they collected
a professor in the psychology department would like to determine whether there has been a significant change in grading
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