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Suppose that we are at time zero. Passengers arrive at a train station according to a Poisson process with intensity λ. Compute the expected value of the total waiting time of all passengers who have come to the station in order to catch a train that leaves at time t.
A month of sales data are collected on sales of different types of computer products Run the t-tests to determine:
A regional director responsible for business development in the state of pennsylvania is cocerned about the number of small business failures. If the mean of small businsses failures per month is 10,
A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 95% of all samples of size 20 taken from the population.
the president of a company that manufactures air conditioners is considering switching his supplier of condensers.
Suppose two-tailed test, state hypotheses (Ho and H1 ) for two-tailed test. Using symbols, define hypotheses (Ho and H1) for two-tailed test.
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
Assume a sample of 25 women is needed for the study. What type/s of method/s of random selection can you use to determine which women should be asked to participate in the study?
question the average heights of a random sample of 400 people from a city is 1.75 m. it is known that the heights of
Calculate the upper bound for a 90% one-sided confidence interval estimate for the rate of noncompliance. Based on (a), what should the auditor conclude?
Problem 1: Estimate the area of the colored region (in orange) by Monte-Carlo simulation with 5000 replications given the distances shown in the figure below.
assume that the lives of all such bulb (approximately) normally distribution. Make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
a pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. from
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