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An experiment was performed to investigate the effectiveness of five insulating materials. Four samples of each material were tested at an elevated voltage level to accelerate the time to failure. T
The alarm system works as long as at least one of the components works.Probability that component A fails to work, is 0.03, proba- bility that component B fails to work is 0.09 and probability that
Biting an unpopped kernel of popcorn hurts! As an experiment, a self-confessed connoisseur of cheap popcorn carefully counted 773 kernels and put them in a popper. After popping, the unpopped kerne
Estimate the percentage of Germans who are at least 30 years old but are not yet 40 years old. You may want to construct a histogram to solve for this; don't round in your answer. Please show as muc
A biology professor gives a surprise quiz consisting of a true/false question followed by a multiple choice question with four possible answers. If both questions are answered with random guesses, w
52% of the students at a cetain college are females. 5% of the students in this college are majoring in computer science. 2% of the students are women majoring in computer science. if a student is s
The purchasing department of a major company has 100 employees, 22 of whom have no kids, 50 of whom have exactly one child, and 28 of whom have exactly two kids. Find the mean number of kids, find t
Suppose we find that among couples that have lived together before they marry 60% end in divorce. Further, among couples that did not live together before they marry 45% end in divorce.
A researcher reports that the time (in minutes) it takes children who are "picky eaters" to finish their vegetables is negatively skewed, with children finishing their vegetables in 4.2±1.0 (
The following data were collected to determine whether the chance that a horse will win a race is influenced by its starting position. Data represent 144 races, each with exactly eight horses in the
Explain the circumstances that can lead to a reversal in a comparison between two groups.
This exercise illustrates that poor quality can affect schedules and costs. A manufacturing process has 70 customer orders to fill. Each order requires one component part that is purchased from a su
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
What are the values of the mean and standard deviation for the original sample?
The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
A random sample of size 81 is drawn from a population with a standard deviation of 12. If only 18% of the time a sample mean greater than 300 is obtained, what is the mean of the population?
It is known that 5% of the members of a population have disease A, which can be discovered by a bloodtest. Suppose that N (a large number) people are to be tested.
A network administrator needs to assign temporary passwords to users. This is done by assigning a 10-digit password which contains each of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 exactly once. Howev
The lifetime, in years, of a satellite placed in orbit is given by the following pdf:
In the table below, the random variable x represents the number of cups or cans of caffeinated beverages consumed by Americans each day based on data from the National Sleep Foundation.
Team A has 7 male and 2 female players, and Team b has 5 males and 4 females. Two players are selected from each the two teams. In how many ways can the four players be selected so that at least on
The lifetime, in years, of a satellite placed in orbit is given by the following pdf
How do we know whether all parties to a contract understand the operational definition in the same way? Explain why there is no true value of something we measure.
What symbol is used for the standard deviation when it is a sample statistics? What symbol is used for the standard deviation when it is a population parameter?
Find the endpoints of the 95% confidence interval for the population mean when x= 55, SD= 4.8, and n= 24.