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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
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
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
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. The local newspaper finds that 53
A May 2007 Gallup Poll found that only 11% of a random sample of 1003 adults approved of attempts to clone a human. Find the margin of error for 95% confidence.
In a poll taken in March of 2007, Gallup asked 1006 national adults whether they were baseball fans. 36% said they were. What is the margin of error for 99% confidence?
In January 2007 Consumer Reports published their study of bacterial contamination of chicken sold in the U.S. They purchased 525 broiler chickens from various kinds of food stores in 23 states and t
The following regression model has been computed based on a sample of twenty observations: = 34.2 + 19.3x. The first observations in the sample for y and x were 300 and 18, respectively. Given this,
Defects Production Rate Per Hour 20 400 30 450 10 350 20 375 30 400 25 400 30 450 20 300 10 300 40 300 Given these sample data, the simple linear regression model for predicting the number of defect
Every Normal model is defined by its parameters: the mean and the standard deviation. Suppose that the mean ?= 20, and that 45% of the area is above 30. What is the standard deviation?
In the Normal model N(100,16) for IQs, what cutoff values bound the middle 80% of all IQs?
In the Normal model N(100,16) for IQs, what cutoff value bounds the highest 5% of all IQs?
The American Veterinary Association claims that the annual cost of medical care for dogs averages $100 with a standard deviation of $30. For cats it averages $120 with a standard deviation of $35.