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A technician services machines of companies operating in the Phoenix Area. Depending on the type of malfunction, the service call can take exactly 1,2,3,4 hours. The different types of malfunctions occur at the same frequency. Develop a probability distribution for the duration of a service call. Duration of call (x) f(x) 1 2 3 4 What is the probability that a service call will take three hours? What is the probability that a service call will take more than 2 hours?
Determine the point estimate? Give the symbol and value.
Assert with probability of at least 0.95 that the error of her estimate will not exceed 0.07. How large a sample, n, will she require if she has no idea what the true proportion is.
Standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked by employees in all payroll departments?
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
If a filled container of juice is selected at random, what is the probability that it is a nonconforming container? If a filled container of juice is selected at random, what is the probability that it was filled on machine II?
A machine cuts circular filters from large rolls of material. If 7.3% of the filters fail to meet specifications, use the normal approximation to the binomial to compute the probability that a sample of 100 of the filters will contain 5 or fewer that..
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
Estimate a multiple regression model using revenue as your dependent variable. For independent variables, include population, average income, screens, theatre age, and dummy variables for mall and strip mall.
It's estimated that 57% of Americans live in households with 1 or 2 people, 32% live in households with 3 or 4 people and 11% live in households with 5 or more.
Find the strategy that maximizes the manufacturer's expected net earnings and Should the manufacturer routinely obtain credit rating reports on those retailers who seek credit approval? Why or why not?
Bolts are randomly selected until a 5 mm bolt is obtained. The outcomes are the sequences of bolts that can be selected. So one outcome is 1, and the other is 342. List the equally likely outcomes.
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