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Recently, a company tested three different machine types to see if there was a difference in the mean thickness of products produced by the three. A random sample of ten products was selected from t
What are the possible values of the number of defective betteries in the sample? What is the pribability the batch will be shipped?
What is the probability that the time until the first arrival exceeds 1.0 units of time? Determine the mean arrival rate such that the probability is 0.9 that there are no arrivals in 0.3 time units.
Poisson Distribution: In studying a rare disease, researchers notice that there is a 1 in 1000 chance of a person contracting the disease in a given year. If the researchers study a population of 10
A random sample of elementary school children in new york state is to be selected to estimate the proportion p who has received a medical examination during the past year.
Scores on a certain intelligence test for children between ages 13 and 15 years are approximately normally distributed with ?=106 and ?=27.
Almost all medical schools in the United States require applicants to take the Medical College Admission Test (MCAT). On one exam, the scores of all applicants on the biological sciences part of the
A researcher is studying test anxiety using a standardized instrument that has a mean of 50 and a standard deviation of 10. The researcher collects a sample of 25 students from a statistics class to
A national magazine claims that the average college student watches less TV than the general public. The national average is 29.4 hours per week, with a standard deviation of 2 hours.
The distribution of heights of adult men in the U.S. is approximately normal with mean 69 inches and standard deviation 2.5 inches.
Find the probability of throwing a sum of 11 at least 3 times in 11 throws of a pair of fair dice.
Suppose IQ scores were obtained from randomly selected siblings. For 20 such pairs of people, the linear correlation coefficient is 0.913 and the equation of the regression line is ybar = -15.61 + 1.
The employees of a firm that does asbestos cleanup are being tested for indications of asbestos in their lungs. The firm is asked to send four employees who have positive indications of asbestos on
A shipment of 30 tires arrived at a tire shop this past weekend and, unknown to the manager eight of the tires are defective. The manager already has randomly selected three of the tires and sold th
Assume that aces are assigned a value to maximize the value of the hand without going bust. What are the range of possible hand values? Determine the distribution function for the range of hand valu
The most accurate statement about research articles in psychology is that:
The average reported is 3.4, and the reported coefficient of variation is 1.8%. Use this information to determine the standard deviation of the annual number of visits to physicians made by males. (
The mean and standard deviation of the 50 prime rates were: mean = 9.1% and std = .24% . If the research firm wanted to be 90% confident in its estimates (z value for 90 percent = 1.645), what would
A particular pitching machine is manufactured so that it will throw the ball into the strike zone of a 6-foot batter 90% of the time. What is the average number of pitches that it will throw in orde
A manufacturer has designed a process to produce pipes that are 10 feet long. The distribution of the pipe length, however, is actually Uniform on the interval 10 feet to 10.89 feet.
Calls to a customer service center last on average 2.4 minutes with a standard deviation of 1.5 minutes. An operator in the call center is required to answer 69 calls each day. Assume the call time
A particular variety of watermelon weighs on average 23.8 pounds with a standard deviation of 1.35 pounds. Consider the sample mean weight of 76 watermelons of this variety. Assume the individual w
1) Let Pn be the probability that three consecutive heads will not appear in n tosses of a fair coin.