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An important part of the customer service responsibilities of a cable company relates to the speed with which trouble in service can be repaired.
Fit both logistic and probit models, modelling proportion killed as a function of nicotine concentration. Are there any obvious differences in the fit of these models?
On average, Josh makes three word-processing errors per page on the first draft of his reports for work. What is the probability that on the next page he will make
Assuming a normal distribution of item values, what percentage of values would you expect to be out of bounds when the process is in control? What do you think is the rationale for this practice?
Let X be a discrete random variable with pmf f(x) and cdf F(x). Prove F(x) is a non-decreasing function, that is if x1< 2 then F(x1)<= F(x2). Under what condition will F(x1)=F(x2)?
Assuming that diastolic blood pressure measurements are Normally distributed, the DBP reading that represents the 80th percentile of the distribution is _____.
Assume that 64% of twins are of the same gender. Given that a newborn set of twins is of the same gender, what is the conditional probability that the twins are identical?
Predict the wolf population in (b) using the regression line itself. What percentage of the variation in the data is explained by the regression line?
The number of telephone calls that arrive at a phone exchange is often modeled as a poisson random variable. assume that on average there are 10 calls per hour,
A company has 7 senior and 5 junior officers. An ad hoc legislative committee is to be formed. In how many ways can a 5-officer committee be formed so that it is composed of:
To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples?
Suppose that each ticket costs $5 and the total cost of giving the concert is fixed and equal $2000. Then, if Y denotes profit from the concert, we have Y = 5X - 2000. What is the expected profit?
A survey of 77 freshman business students at a large university produced the following results: 25 of the students read bloomberg business week
At a day care, there are 5 apples, 8 pears and 12 oranges available for snack time. Marsha & Adrienne get to the front of the line ( in that order ) and get first pick at the fruit.
Suppose that a fair coin is tossed repeatedly and let N be the number of tosses until the rst heads is obtained. Find the probability mass function of N.
Recalling that the variance is the measure of spread or dispersion, do you expect the variance of X to be larger than smaller than or equal to o^2 = V(Y)? why?
A professor wishes to recruit 2 students for a research project. The probability that a student will accept the position is 0.30. What is the probability that 4 students must be asked before 2 acce
If you selefected repeated samples of size twelve from the U.S. population, what would be the mean number of individuals per sample who do not exercise regularly? What would be the standard deviatio
Refer to the scatter diagram you created. Is the relationship between the variables weak, moderate, or strong? Create a table of summary statistics for the data. Paste it into the document below.
A homeowner was interested in the size of homes in Buncombe County. He went door to door in his subdivision and recorded the size (in square feet) of the 30 homes in that subdivision. From this data
At least 31 can taste the difference between the two oils? (Round your answer to four decimal places.) At most 6% can taste the difference between the two oils? (Round your answer to four decimal plac
If two random samples of size 400 are drawn from two populations that have standard deviations of $60 and $8 respectively, the relevant sample distribution, to test the difference in the two populat
A market research study is being conducted to determine if a product modification will be received well by the public. A total of 1,000 consumers are questioned regarding this product. The table be
A large corporation receives express mail deliveries at its main office in New York daily. The express mail is delivered by two firms: Fad Express and Emerald. From recent corporate data, 60 percent
In a population of 1,000 subjects, 800 are unemployed. In the same population, 700 of the subjects are males. Of the males, 600 are unemployed.. Let M= the event that a person is male and E= the eve