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A production line manufactures 1000-ohm ( ) resistors that have 10 percent tolerance. Let X denote the resistance of a resistor. Assuming that X is a normal R.V. with mean 1000 and variance 2500, fi
It has been reported that about 35% of U.S. adults attended a sports event during the previous year. What are the odds that a randomly selected U.S. adult attended a sports event during the year?
How large could a tumor grow before a researcher might consider it to be an outlier and would want to double check the measurement.
Find the probability among 6 randomly selected graduates, that at most 2 of them find a job in his or her chosen field within a year.
Because of the casual sampling methodology in this survey, the sample sizes are unequal. Research question: Are the mean annual attendance rates the same for employees in these three departments? Da
Suppose that for a particular flight involving a jumbo-jet with 261 seats, the airline sells 276 tickets. What is the probability that the airline will not have enough seats for all the ticket holde
find the probability of more than 213 people showing up with reservations, assuming that 236 reservations were accepted. Round your answer to three decimal places.
Do these data support the claim made by some female managers within the organizations? Report and interpret the p-value.
The mean weight of loads of bricks is 46.0 tons with a standard deviation of 8.0 tons. Twenty-five loads are chosen at random for a weight check. Find the probability that the mean weight of those l
One of the Major benefits of e-mail is that it makes it possible to communicate rapidly without getting a busy. Does the distribution of responses differ from the distribution obtained from the publis
Find the mean and the standard deviation of the sampling distribution of x, and find an interval containing 95.44 percent of all possible sample mean returns.
A list of ten employee salaries has a mean of $80,000, a median of $52,000 and a standard deviation of $24,000. The largest salary on the list is $100,000 and is accidentally changed to $1,000,000.
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
What is the probability that at least one left-handed student in this class is forced to use a seat designed for a right-hander?
transforming data set has a mean of 12.3 minutes and a standard deviation of 4.0 minutes. what is the mean after 5.0 minutes have been added to every value?
Teachers' salaries A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the stand
What is the probability that the sample proportion of grocery stores selling Haagen-Dazs ice-cream, will be within 0.01 of the population proportion?
The probability that a tomato seed will germinate is 60%. A gardener plants in batches of 12. What is the probability that all seeds will germinate?
Graduates from a graphic arts course at a community college have a mean starting salary of $42,000 with a standard deviation of $1,500. From a sample of 64 graduates, what is the probability that th
On the average, it took them 19.5 seconds to cross the street, with a sample standard deviation of five seconds. Assume the time to cross the road has a normal distribution.In terms of traffic flow
The Pristine Paint Company produces paint in gallon cans. They have found that in more than 10 samples of 8 cans each, the average gallon can contains 1.1 gallons of paint. The average range found o
At the .05 level of significance, is there a difference in the mean number of months before a raise was granted among the four CPA firms?
Assume that a study is performed and in this study, subjects are asked to maintain eye contact with another individual for as long as possible. The length of time recorded is normally distributed w
A laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 186 milligrams with s = 19.0 milligrams. Construct a 95% confidence interval for the true mean cholesterol c
Do the data indicate that the nurses from the nonmagnet hospitals have a different distribution of opinions? Use α = 0.05.