The number of traffic accidents that occur on a particular stretch of road during a month follows a Poisson distribution with a mean of 7.2. Find the probability that less than three accidents will occur next month on this stretch of road.
A) 0.025474 B) 0.071917 C) 0.974526 D) 0.928083
Q. 2Find the z-scores for which 98 of the distributions area lies between -z and z.
A) (-2.33, 2.33 ) B) (-1.645, 1.645 ) C) (-1.96, 1.96 ) D) (-0.99, 0.99 )
Q. 3Find the standardized test statistic estimate, z, to test the hypothesis that p1 > p2. Use = 0.01. The sample statistics listed below are from independent samples. Sample statistics: n1 = 100, x1 = 38, and n2 = 140, x2 = 50
A) 0.362 B) 2.116 C) 1.324 D) 0.638
Q. 4Find the critical t-value that corresponds to 99 confidence and n = 10.
A) 2.821 B) 3.250 C) 2.262 D) 1.833
Q. 5You toss a fair coin 5 times. What is the probability of at least one head? Round to the nearest ten-thousandth.
A) 0.9688 B) 0.7500 C) 0.5000 D) 0.0313
Q. 6The United States can be divided into four geographical regions: Northeast, South, Midwest, and West.
The Northeast region consists of 9 states; the South region consists of 16 states; the Midwest consists of 12 states; and the West consists of 13 states. If a survey is to be administered to the governors of 10 of the states and we want equal representation for the states in each of the four regions, how many states from the South should be selected? Round to the nearest whole state. A) 3 B) 4 C) 2 D) 5
Q. 7The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 6. Find the probability that more than four road construction projects are currently taking place in the city.
A) 0.714943 B) 0.848796 C) 0.285057 D) 0.151204
Q. 8Find the z-scores for which 90 of the distributions area lies between -z and z.
A) (-1.645, 1.645 ) B) (-2.33, 2.33 ) C) (-1.96, 1.96 ) D) (-0.99, 0.99 )
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