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Question: A computer job must pass through two queues before it is processed. Suppose the waiting time in the first queue is exponential with rate α, and the waiting time in the second queue is exponential with rate β, independent of the first.
a) Find the density of the total time the job spends waiting in the two queues. Sketch the density in case α = 1 and β = 2.
b) Find the expected total waiting time in terms of α and β.
c) Find the SD of the total waiting time in terms of α and β.
variance, and standard deviation of the overdraft amount. Find the probability that a randomly selected bank has an overdraft fee greater than $25
How might you design an experiment that will effectively collect data for this chosen hypothesis? How will you minimize threats to validity? Will it be a true experiment or a quasi-experiment?
Take the heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2 °C and h2 = 40 W/m2 °C, which includes the effects of radiation.
A researcher investigating sex role stereotypes and occupational aspirations drew a random sample of 125 female university students.
What is the value of k? (Hint: g p 1 y2 5 1.) What is the probability that at most three forms are required? What is the probability that between two and four forms (inclusive) are required?
the wayne manufacturing company purchases a certain part from suppliers a b and c. suppler a supplies 65 of the parts b
a random sample of 55 standard hotel rooms in the philadelphia pa area has a mean nightly cost of 154.17 and a standard
For each of the following research situations, identify the level of measurement of all variables. Also, decide which statistical applications are used:
Using the data from this poll, test the claim that the percent of drivers who enjoy driving their cars has declined since 1991. Report the large-sample z statistic and its P-value.
Discuss ratio, interval, nominal and ordinal variables. Explain what is meant by a margin of error for a confidence interval.
In each of the following cases, the variable represents one way that a sample can be stratified in a study.
The National Safety Council reported that air bag-related fatalities dropped to 18 in the year 2000. Compute the expected number of air bag-related fatalities.
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