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Telephone calls enter a college switchboard at a mean rate of two thirds of a call per minute according to a poisson process. Let X denote the waiting time until the tenth call arrives. What is the pdf of X? What are the moment generating function, mean , and variance of X?
Create a 99 percent confidence interval for difference in means between Line B and Line C.
A window is in the shape of a square of side s, with a semicircle of diameter s above it. Write a function that expresses the total area of the window as a function of s.
If a randomly selected student is a female student, what is the probability she is a C student?
Below are scores for 10 randomly selected students on each exam. 95% confidence interval for the mean scores on?
The chance of winning a prize for each of the 15 plays is 50-50 if you bought 15 tickets, what is the chance of winning 10 or more prizes?
The heights in centimeters of 5 students are: 165, 175, 176, 159, 170. The sample median and sample mean are respectively:
Would it be reasonable to conclude that the population mean is 63 pounds?
Specify the null and alternative hypotheses you would use to determine if the opinions of Internet users are evenly divided among the four categories.
Barbara Flynn is in charge of maintaining hospital supplies at General Hospital. During the past year, the mean lead time demand for bandage BX-5 was 60 (and was normally distributed).
You are interested in knowing if there is a statistical difference in driving speeds between Day 1 and Day 10. Which statistical test would be appropriate? Why?
Construct a 95% confidence interval estimate for the population proportion of adults who report that e-mails are easy to misinterpret.
Determine whether each of the distributions given below represents a probability distribution. Justify your answer.
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