Find the standardized test statistic, z to test the hypothesis that p1 = p2. Use = 0.05. The sample statistics listed below are from independent samples. Sample statistics: n1 = 50, x1 = 35, and n2 = 60, x2 = 40
A) 0.374 B) 0.982 C) 1.328 D) 2.361
Q. 2Find the t-value such that the area left of the t-value is 0.025 with 17 degrees of freedom.
A) -2.11 B) -3.222 C) 2.110 D) 2.120
Q. 3An education researcher randomly selects 60 of the nations junior colleges and interviews all of the professors at each school. What sampling technique was used?
A) cluster
B) simple random
C) stratified
D) convenience
E) systematic
Q. 4Investment in new issues (the stock of newly formed companies) can be both suicidal and rewarding. Suppose that of 500 newly formed companies in 2010, only 18 appeared to have outstanding prospects.
Suppose that you had selected two of these 500 companies back in 2010. Find the probability that at least one of your companies had outstanding prospects. A) 0.0707735 B) 0.3581242 C) 0.9292265 D) 0.0347735
Q. 5The number of road construction projects that take place at any one time in a certain city follows a Poisson distribution with a mean of 5. Find the probability that exactly six road construction projects are currently taking place in this city.
A) 0.146223 B) 0.322754 C) 0.072770 D) 0.160623
Q. 6A university compared the mean salary of its science graduates ten years after graduation with the mean salary of its social science graduates ten years after graduation.
A) quantitative, independent B) qualitative, dependent
C) quantitative, dependent D) qualitative, independent
Q. 7Find the probability that of 25 randomly selected students, no two share the same birthday.
A) 0.431 B) 0.995 C) 0.569 D) 0.068
Q. 8Determine the two z-scores that separate the middle 87.4 of the distribution from the area in the tails of the standard normal distribution.
A) -1.53, 1.53 B) -1.39, 1.39 C) -1.46, 1.46 D) -1.45, 1.45
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