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A fair coin is tossed 200 times. Using the Central Limit Theorem, what is theprobability that the fraction (frequency) of Tails is between 0.49 and 0.51?
Gerald Black of BlackFly Airline has an exclusive contract to run flights of a four-passenger aircraft to a remote mining center. His contract requires him to fly if there are any passengers wanting to make the trip. His fixed costs per day ar..
An insurance investigator has observed the people with some astrological signs tend to be safer drivers the people with other signs. Using insurance records, the investigator classified 200 people according to their astrological signs and whether or ..
Find the probability of getting five successes out of the eight trials.
The average weekly earnings of the plumbers in a city is [Mu=$750] with a standard deviation of [s=$40]. Assume that we select a random sample of [n=64 plumbers], what is the probability that the sample mean [x] will be greater than $740 or greater t..
Let variable X represents the improvement in time for each assembly line worker. Let μ represents the average improvement in time for the population. Has the training improved the time required on the job? Please test the hypothesis use α=0.05 ..
An experimenter wants to conduct a hypothesis test on a claim that there was no differencebetween two population means. That is, H0: μ1 - μ2 = 0. Which of the following 95% confidenceintervals on the difference, μ1 - μ2, would lead to rejectio..
Joe Henderson runs a small metal parts shop. The shop contains 3 machines- a drill press, lathe, and a grinder. Joehas three operators, each a re certified to work on all three machines. However, each operator performs better on some machin..
A steel company is producing steel for a new contract. The contract specifies the information in the following table for the steel. MATERIAL MINIMUM MAXIMUM Maganese 2.10% 3.10% Silicon 4.30% 6.30% Carbon 1.05% 2.05% The steel company mixes batches o..
Identify the type of observational study (cross-sectional, retrospective, or prospective) described
For a set of 15 data points, a computer statistical package has found the multiple regression equation to be y ^ = -23 + 20x_1+ 5x_2 + 25x_3 and has listed the t-ratio for testing the significance of each partial regression coefficient. Using the 0.0..
Water specimens contain nitrates, a solution that is dropped into the water will cause the specimen to turn red 95% of the time. When used on water specimens without nitrates, the solution turns the water red 10% of the time. Past experience in the l..
Non parametric tests
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