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The amounts spent in vending machines in the United States, in billions of dollars, for the years 1999 through 2003 are given below. Determine the least squares trend equation.
Year Code X Vending Machine Sales ($ billions) Y 1999 1 17.5 2000 2 19.0 2001 3 21.0 2002 4 22.7 2003 5 24.0
By using regression analysis.
Determine the probability that number of requests in 10 hour work day is between 68 and 80 inclusive? Give your answer to four decimal places.
Suppose that 55 percent of the people in a population of 500,000 support your candidate. If you conduct a poll of 1,000 people, what is the interval that has a 95 percent chance of containing the results of your poll?
You're a risk manager of ABC company and you are reevaulating your insurance contract. Your insurer has informed you that the expected value of frequency per month for ABC is 2.43.
In this problem we want to run a test of goodness of fit to check whether the coats in the consignment follow the indicated probabilities.
Consider a hypothesis test of H0: μ = 0 against H1: μ > 0 where μ is the mean percent change in total body bone mineral content of young women. The population standard deviation is σ = 2. The level of significance for the test is α = 0.05.
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence
47% of students have children under 17 living at home with them. Find the probability that a random sample of 800 students will return more than 50% students with children under 17 living at home with them.
Develop a 95% confidence interval for the proportion of the population of adults who feel customer service is better today than it was 2 years ago.
a) 95% of confidence intervals generated will include the sample mean X. b) 5% of the confidence intervals generated will include the true mean μ
In a study designed to determine patientâ??s acceptance of a new pain reliever, 100 physicians each selected a sample of 25 patients to participate in the study.
Past studies have shown that only 95% of booked passengers actually show up for the flight. What is the probability that exactly 99 booked passengers actually show up for the flight?
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