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If we have no information about the proportion of votes that either candidate received, determine the sample size necessary to be 95% confident that the error will be within 4 percentage points.
The average weight of adult men is 181 pounds with a standard deviation of 40 pounds. Thirty five (35) men were asked their weight and the mean was calculated to be 185.
The weight of a bag of corn chips is normally distributed with a mean of 22 ounces and a standard deviation of ½ ounces. Answer these questions. What is the probability that a bag of c
Two airplanes are flying in the same direction in adjacent parallel corridors. At time t = 0, the first airplane is 10 km ahead of the second one. Suppose the speed of the first plane (km/hr) is nor
Use the decision tree to determine how many machines the company should buy initially and give the expected payoff for this alternative.
As a sample size approaches infinity, how does the student's t distribution compare to the normal z distribution? When a researcher draws a sample from a normal distribution, what can one conclude a
What is the probability that the mean will be less than 15.3 ounces? If you were in charge of filling the boxes and the sample of 25 boxes that you chose had a mean of 15.3 ounces what action would
What is the initial outlay associated with this project? What are the annual after-tax cash flows associated with this project for years 1 through 9?
The speed with which utility companies can resolve problems is very important. GTC, the Georgetown Telephone Company, reports it can resolve customer problems the same day they are reported in 74 pe
Based on your confidence interval, is it reasonable to assume that 99% of pipes have surface roughness measurements that fall in that interval? Briefly explain your answer.
Taking the diamonds listed in the advertisement as a simple random sample of all diamonds available for sale on the open market, find a 95% confidence interval for the proportion of diamonds that ar
If one student is chosen randomly, what is the probability that he or she is taking at least one language class? If two students are chosen randomly, what is the probability that at least one of them
An instructor gives his class a set of 13 problems with the information that the next quiz will consist of a random selection of 3 of them. If a student has figured out how to do 9 of the problems,
In how many different ways can the 4 computers be chosen? What is the probability that exactly one of the computers will be defective?
A spymaster has a network of 7 operatives whom he pays out of a slush fund containing $20000. For accounting reasons, his service requires him to use up his entire fund and to pay his operatives in
Manufacture of a certain component requires three different machining operations. Machining time for each operation has a normal distribution, and the three times are independent of one another.
The breaking strength of a rivet has a mean value of 10,050 psi and a standard deviation of 505 psi. What is the probability that the sample mean breaking strength for a random sample of 40 rivets is
Explain why this number is so much larger than the average number of goals made. Also explain how you use the table from the back of the book to arrive at this answer.
The U.S. Census Bureau collects and analyzes data on numerous aspects of American life by state, including the percentage of people with high school degrees, bachelor's degrees, and advanced degrees
What names would you give the independent and dependent variables; Is the dependent variable discrete or continuous?
In a university statistics course a correlation of -0.8 was found between numbers of classes missed and course grade. This means that the fewer classes students missed, the higher the grade.
A research study has stated that the taxes paid by individuals is correlated at a .78 value with the age of the individual. Given this, the scatter plot would show points that would fall on straight
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. Which group (newspaper or student