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The performance ratings of two sports cars, the Mazda RX7 and the Nissan 300ZX, are to be compared. A random sample of 40 drivers is selected to drive the two models. Each driver tries one car of each model, and the 40 cars of each model are chosen randomly. The time of each test drive is recorded for each driver and model.
The difference in time (Mazda time - Nissan time) is computed, and from these differences a sample mean and a sample standard deviation are obtained. The results are D‾ = 5.0 seconds and SD = 2.3 seconds. Based on these data, which model has higher performance? Explain. Also give a 95% confidence interval for the average time difference, in seconds, for the two models over the course driven.
In one city, the probability that a person will pass his or her driving test on the first attempt is 0.62. 11 people are selected at random from among those taking their driving test for the first time. What is the probability that among these 11 ..
suppose that a 2-year old boy named cahnce sits at a computer and types exactly 6 unique alphabet keys. what is the
Children toilet train (training age normally distributed) at an average of 26 months with a standard deviation of 2 months. How lilely is child to be trained after 30 months?
researchers studied the effects of adding an exercise program to dieting in the achievement of weight loss. a sample of
Crash Test Results The National Transportation Safety Administration conducted crash test experiments on five subcompact cars. The head injury data (in hic) recorded from crash test dummies in the driver's seat are as follows: 681, 428, 917, 898, ..
the data set toxemia contains information for a sample of 100 infants born in two hospitals in boston. indicators of a
Drawing the standard normal curve and indicating the area representing the probability and
a study of cats and dogs found that 25 of 45 cats and 44 of 60 dogs slept more than 10 hours per day. at the .05 level
A sample of 100 one-dollar bills from the Subway cash register revealed that 16 had something written on them besides the normal printing (e.g., “Bob ? Mary”). (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or ..
The manager of a sport fishing products company wants to test the null hypothesis that a certain lead fishing weights have a mean weight of 4.0 ounces. Under what conditions would the manager commit a Type 1 error?
The period of the orbit is 2.3 hours. The radius of the planet is 4.34 × 106 m. What would be the true weight of the satellite if it were at rest on the planet's surface?
A six-sided die is rolled 30 times and the numbers 1 through 6 appear as shown in the following frequency distribution. At the .10 significance level, can we conclude that the die is fair?
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