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A contractor purchases a bulldozer for $36,500. The bulldozer requires an average expenditure of $5.25 per hour for fuel and maintenance, and the operator is paid $11.50 per hour. Assuming the customers are charged $27 per hour of bulldozer use, write an equation for the revenue R derived from t hours of use.
The mean score for freshman on an aptitude test at a certain college is 800 with a standard deviation of 50. That is the probability that two groups of students selected at random, consisting of 36 and 49 students, respectively, will differ in the..
A market researcher is interested in knowing the type of training that works best for DVD users. Thirty consumers are randomly selected from a population of known DVD owners (i.e., users).
Using the 0.05 level of significance, is there evidence that the population mean is above $300? What is your answer in (a) if s = $90 and the 0.10 level of significance is used?
Judging from recent experience, 5 percent of the computer keyboards produced by an automatic, high-speed machine are defective
The probability that the patient enters a law suit is 0.9. What is the probability that the doctor makes an incorrect diagnosis and the patient sues.
Suppose we estimate this model with OLS, and there is a correlation between unobserved student traits (in the error term) with attendance. How does this bias the coefficient of attendance?
The proportion who died from coronary heart disease was .00669 for smokers and .00413 for nonsmokers. Describe the association of smoking each alung cancer.
the time between arrivals of taxis at a busy intersection is exponentially distributed with a mean of 10 minutes.a what
the move-it company has two plants building forklift trucks that then are shipped to three distribution centers
in a group of 15 batteries 6 are dead. you chose 2 at random. the expected number of good batteries is 1.2. what is the
The results of a recent poll on the preference of shoppers regarding two products are shown below.
Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
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