Managerial Statistics Practice testThis entry was posted in Quiz Statistics by Kamal Kishore Instructions for Students: 1- Kindly attempt all the questions, before submitting. 2- For every correct answer, you will get 1 mark. 3- There is no negative marking. 4- Try to submit quiz, before the time runs out. 5- DO NOT REFRESH OR PRESS BACK BUTTON ON YOUR WEB BROWSER. All the best. Name Email 1. Which one of these variables is a binomial random variable? number of textbooks a randomly selected student bought this term number of CDs a randomly selected person owns number of women taller than 68 inches in a random sample of 5 women time it takes a randomly selected student to complete a multiple choice exam 2. which of the following is a correct statement? Probabilities are numbers whose values can be from -1 to +1 If two events are dependent, then the probabilty both event will occur is the multiplication of their respective probabilties The total of all the probabilities assigned to all outcomes in a sample space must be equal to 1.0 An event that is certain not to happen has a probability of 1.0 Probabilities are always whole numbers3. Let A and B be events such that P (A) = 0.7 and P (B) = 0.9. Calculate the largest possible value of P (A ∪ B) − P (A ∩ B). 0.34 0.20 0.60 0.40 1.604. A randomly selected sample of 400 students at a university with 15-week semesters was asked whether or not they think the semester should be shortened to 14 weeks (with longer classes). Forty six percent (46%) of the 400 students surveyed answered "yes." Which one of the following statements about the number 46% is correct? It is a standard error. It is a margin of error. It is a population parameter. It is a sample statistic.5. If you are told a population has a mean of 25 and a variance of 0, what must you conclude? None of the above. There is only one element in the population. All the elements in the population are 25. There are no elements in the population. Someone has made a mistake.6. A Tyre Company stocks three brands of tyre: brand X; brand Y and brand Z. 40% are Brand X, 35% are brand Y and 25% are brand Z. The percentage of defective tyres are 2% of brand X, 1% of brand Y and 3% of brand Z. If a tyre is picked at random what is the probability that it is defective? 0.060 0.060 0.019 0.366 7. Suppose that the probability of event A is 0.2 and the probability of event B is 0.4. Also, suppose that the two events are independent. Then P(A|B) is: None of the above. P(A) = 0.2 P(A) × P(B) = (0.2)(0.4) = 0.08 P(A)/P(B) = 0.2/0.4 = ½ 8. Which of the following is not a property of a binomial experiment? the experiment consists of a sequence of n identical trials the trials are independent each outcome can be referred to as a success or a failure the probabilities of the two outcomes can change from one trial to the next9. Which one of these variables is a continuous random variable? The time it takes a randomly selected student to complete an exam. The number of correct guesses on a multiple choice test. The number of tattoos for a randomly selected person. The number of women taller than 68 inches in a random sample of 5 women. 10. 4. Which of the following measures of central tendency tends to be most influenced by an extreme score? median mean mode None of the above. 11. A workforce consists of seven workers. How many different three worker teams is it possible to select? 35 210 70 12512. If two events (both with probability greater than 0) are mutually exclusive, then C. They cannot be independent and they cannot be complement B. They must be independent and complement A. They must be independent and could be complement D. They cannot be independent and could be complement13. An experiment consists of making 80 telephone calls in order to sell a particular insurance policy. The random variable in this experiment is a none of the above continuous random variable simplex random variable discrete random variable complex random variable14. Nearly all the distributions are special cases of Poisson distribution F T None of the above15. Suppose that a quiz consists of 20 True-False questions. A student hasn't studied for the exam and will just randomly guesses at all answers (with True and False equally likely). How would you find the probability that the student will get 8 or fewer answers correct? Find the cumulative probability for 8 in a binomial distribution with n = 20 and p = 0.5. Find the probability that X=8 in a binomial distribution with n = 20 and p=0.5. Find the cumulative probability for 8 in a Poisson distribution with n = 20 and p = 0.5. Find the probability that X=8 for a normal distribution with mean of 10 and standard deviation of 5. Workspace Thank you for taking - Managerial Statistics Give your best to show up in the board below: [mlw_quizmaster_leaderboard mlw_quiz=6] Share this:FacebookTwitterEmailGoogleLinkedIn