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Your Results for: "Multiple Choice" Student Name: KELVIN X. CRESPO SOTO Student Email: kcrespocontador@gmail.com Print this page The Print feature requires scripting to function. Your browser either does not support scripting or you have turned scripting off. To print this page, first highlight the text, then select Print from the File menu. Summary of Results 67% Correct of 15 Scored items: 10 Correct: Site Title: Basic Business Statistics, 11e Book Title: Basic Business Statistics, 11e 5 Incorrect: 67% 33% More information about scoring Book Author: Berenson Location on Chapter 6 > Self-Study Quizzes > Site: Multiple Choice Date/Time July 3, 2015 at 3:24 AM (UTC/GMT) Submitted: 1. Which of the following characteristics do normal and uniform distributions have in common? Your Answer: The distributions are symmetric and the mean is equal to the median. Correct 2. The figure below represents which of the following distributions? Your Answer: Normal Correct 3. If x is uniformly distributed from 5 to 12, (5 ≤ x ≤ 12), determine the standard deviation of this distribution. Your Answer: (blank) 4. The area to the right of the mean in a normal distribution is indicated by which of the following? Your Answer: 0.5 Correct 5. A standard normal distribution has which of the following properties? Your Answer: The mean is equal to 0 and the variance is equal to 1. Correct 6. Let z be a normal random variable with a mean of 0 and a standard deviation of 1. Determine P(z ≤ 1.4). Your Answer: 0.0808 Correct Answer: 0.9192 This is P(z ≤ -1.4). 7. Let x be a normal random variable with a mean of 50 and a standard deviation of 3. A z score was calculated for x, and the z score is -1.2. What is the value of x? Your Answer: 46.4 Correct 8. Let x be a normal random variable with a mean of 35 and a standard deviation of 4. Determine P(30 ≤ x ≤ 37). Your Answer: 0.5859 Correct 9. What percentage of a normal distribution is found within a range of z scores from -2 to +2? Your Answer: 90% Correct Answer: 95% 0.9772 – 0.0228 indicates approximately 95% of the normal distribution falls between z = -2 and z = +2. 10 . Suppose you are working with a data set that is normally distributed with a mean of 70 and a standard deviation of 10. Determine the value of x such that 65% of the values are greater than x. Your Answer: 66 Correct 11 . In which of the following continuous distributions are extreme values most likely (within its range)? Your Answer: Uniform Correct 12 . On the day before an exam in an online class, students email questions to the professor at a rate of 1 every 20 minutes, exponentially distributed. Determine the probability that more than 1 hour elapses between email messages. Your Answer: 5% Correct 13 . For an exponential distribution with the parameter lambda equal to 10 per minute, what is the mean of the exponential distribution? Your Answer: 0 Correct Answer: 0.1 The mean of a standard normal distribution is 0. 14 . Let x be a binomial random variable with n = 30 and p = 0.7. Using the normal distribution to approximate the binomial, to determine the probability of more than 16 but less than 25 successes, which of the following is the correct representation? Your Answer: P(16 < x < 25) Correct Answer: P(16.5 < x < 24.5) The correction for continuity adjustment is 0.5 units outside of the binomial range. In this case, we can consider successes between 17 and 24, inclusive, which leads to a normal approximation that uses 16.5 and 24.5. 15 . Let x be a binomial random variable with n = 25 and p = 0.6. Using the normal distribution to approximate the binomial, determine the probability that more than 12 successes will occur. Your Answer: 0.8461 Correct Copyright © 1995 - 2011 Pearson Education . All rights reserved. Pearson Prentice Hall is an imprint of Pearson . Legal Notice | Privacy Policy | Permissions