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Suppose that wait times for customers at a grocery store cashier line are uniformly distributed between one minutes and fifteen minutes. (a) What are the mean and variance of the waiting time?
If the airline must use at least as many tpe A planes as type B and has available only 42 flight attendants, how many of each type should be used to minimize the cost for the trip?
In the following probability distribution (in table form), the discrete random variable X represents the number of activities the mother of a 6th-8th grade student is involved in.
A given project's expected duration along its critical path is 25 days. Management wants to know the probability that the project will finish in 22 days or less. The variance along the project's cri
What could be the actual number of adults who play football could be? Among the 2286 repondents, 1479 said they only play hockey. What percentage of respondents said they only play hockey?
A car manufacturer is concerned about poor customer satisfaction at one of its dealerships. The management decides to evaluate the satisfaction surveys of its next 50 customers.
For a T random variable with 5 degrees of freedom, find A such that P(T > A) = .975. Answer to three decimal places and use Table II from the back of the text.
What is the value of A such that P(-A < T < A) = .90 for a T random variable with 16 degrees of freedom? Answer to three decimal places. Use Table II from the back of the text.
X is a Chi-Square random variable with 10 degrees of freedom. What is the value of A such that P(X < A) = .025? Answer to two decimal places and use Table III from the back of the text.
The influence of running on preventing heart attacks has been studied by a local runners club. The following twoway table classifies 350 people as runners or non runners, and whether or not th
Propose a sampling strategy for the supervisor. How would you modify the sampling strategy if the company makes both wholesale and retail sales that require different boookkeeping procedures?
What is the 95% confidence interval for the mean turtle weight? How would the confidence interval change if the sample consisted of 13 turtles?
The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 420, the standard deviation 59. What is the
The mean of a normal distribution is 415 pounds. The standard deviation is 12 pounds. What is the area between 420 pounds and the mean of 415 pounds?
What is the percentage of the total area under the normal curve within plus and minus 2.1 standard deviations of the mean?
A new extended-life light bulb has an average service life of 770 hours, with a standard deviation of 51 hours. If the service life of these light bulbs approximates a normal distribution, about wha
Audits. Between quarterly audits, a company checks its accounting procedures to detect problems before they become serious. The accounting staff processes payments on about 120 orders each day. The
A group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the flu. They tested two different types of vaccines: a shot and a nasal spray.
What results in your departments seem to be correlated or related to other activities? How could you verify this? Create a null and alternate hypothesis for one of these issues. What are the manager
The contract speci es that ABC will accept the lot, if a sample size of 10 items from the shipment has no more than 1 defective chip. What is the probability of accepting the shipment? Use the table
An electronic scanner is successful in detecting flaws in a material in 80% of the cases. Three material specimens containing flaws will be tested with the scanner. Assume that the tests are indepen
Tasks are sent to a supercomputer at an average rate of 6 tasks per minute. Their arrivals are modeled by a Binomial counting process with 2-second frames.
Drawing a black card (club or spade) from a standard deck of cards
Introduction: Brief description of the study including the purpose and importance of the research question being asked. What is the null hypothesis? What is the research hypothesis?
Tom parks his car at a meter without paying for 1 hour. A parking enforcement officer checks for parking violations an average of 3 times per hour. However, the officer's eyesight is poor and someti