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In a bank call center, it is determined over a one-year period that 30% of the outgoing calls are answered by a live person, as opposed to being unanswered or picked up on voice mail. The center makes over 200,000 outgoing calls per year. There is an operator at the center who places 25 outgoing calls in a one-hour period. What is the probability that this operator will get live answers on 7 or more calls?
An LU professor is interested in whether there is a difference between undergraduate students and graduate students in the amount of time spent praying each day.
A machine is adjusted so that when under control, the amount of sugar filled in a bag is normally distributed with a mean amount of 5 pounds.
Write a paragraph describing your interpretation when the slope is positive, zero, and negative. If you were buying a home in this particular city, which slope would be most attractive to you and why?
Using the sample obtained, draw a histogram and calculate mean and variance for 1000 sampled values for random variable Y = X2.
Suppose that we generate a random sample from a given dis- tribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size..
A machine produces parts with lengths that are normally distributed with ? = 0.59. A sample of 19 parts has a mean length of 76.26.
What would be an appropriate graphical representation to show the dispersion of home prices in a particular city, such as San Diego? Consider what would be the dependent (y) and independent (x) variables? Explain your reasoning.
Derive an expression for the closed loop transfer function: Because the output is related to the actuating signal by G(s), we have
The American Bar Association conducted a survey in 1986 showed that the average income of lawyers in 1986 was $ 120,000. An investigator took a sample of 64 lawyers in 1990, produced a median income of $ 140,000 with a standard deviation of $ 24.5..
How does multilinear regression analysis apply to your profession? Specify the dependent value and the set of predictors. Where would you get the data?
Discuss a hospitals total maintenance costs, and use regression analysis to estimate the fixed cost element of maintenance and the variable cost associated with the number of patient-days.
Which of the given experiments can be modelled by Poisson distribution?
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