practice-fianl-solutions-v2 - STAT 3502 B Review Last Name...

This preview shows page 1 - 3 out of 22 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Introduction to Probability and Statistics
The document you are viewing contains questions related to this textbook.
Chapter 10 / Exercise 1
Introduction to Probability and Statistics
Beaver/Mendenhall
Expert Verified
By G. Li, Don’t Redistributed STAT 3502 B Review Apr 2016 Last Name First Name Student Number Section 1. This is a closed book exam. 2. Answer all questions and show all appropriate steps in your work; otherwise only partial marks may be awarded. 3. One blank page for your rough calculations are attached to this exam paper. PART I: Multiple Choice Questions(Please Clearly mark your answer on the scantron ) Each multiple-choice question has 4 marks Question 1. An evaluation of a small business by an accounting firm either reveals a problem with the accounts or it doesnt reveal a problem. Also, the evaluation is either done accurately or incorrectly. The probability that the evaluation is done accurately is 0.85. Furthermore, the probability that the evaluation is done incorrectly and that it reveals a problem is 0.10. If the probability that the evaluation is done accurately and it does not reveal a problem is 0.25, what is the probability that the evaluation does not reveal a problem? A. 0.10 B. 0.20 C. 0.35 D. 0.40 Question 2. A random sample of 15 people is taken from a population in which 40% favour a particular political stand. What is the probability that exactly 6 individuals in the sample favour this political stand? A. 0.4000 B. 0.5000 C. 0.4000 D. 0.2070 Question 3. Suppose flaws (cracks, chips, specks, etc.) occur on the surface of glass with density of 3 per square meter. What is the probability of there being exactly 4 flaws on a sheet of glass of area 0.5 square meter? A. 0.047 B. 0.168 C. 0.981 D. 0.815 Question 4. Suppose that an office employs three associates who prepare a certain kind of doc- ument. Delia prepares 60% of these documents, Francis 30%, and Gino 10%. Delia makes an error in 10% of the documents that he prepares, Francis in 25%, and Gino in 5%. What is the probability that a randomly selected document contains an error. A. 0.4 B. 0.001 C. 0.14 D. 1 Question 5. The starting annual salaries of newly qualified chartered accountants (CAs) in South Africa follow a normal distribution with a mean of 180,000 and a standard deviation of 10,000. What is the minimum annual salary earned by the top 10% of newly qualified CAs? A. 196,400 B. 192,800 C. 190,300 D. 198,800 Question 6. Two coins are tossed simultaneously. If one of them turned head, what is the probability that the other one also turn head? A. 0.01 B. 0.05 C. 0.25 D. 0.50 Question 7. Five people get on an elevator that stops at five floors. Assuming that each has an equal probability of going to any one floor, find the probability that they all get off at different floors. A. 0.0083 B. 0.0080 C. 0.0016 D. 0.0384 PART II: For the following questions clearly show all of your work c G.Li Page 1 of 22
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Introduction to Probability and Statistics
The document you are viewing contains questions related to this textbook.
Chapter 10 / Exercise 1
Introduction to Probability and Statistics
Beaver/Mendenhall
Expert Verified
By G. Li, Don’t Redistributed STAT 3502 B Review Apr 2016 Question 1. When human beings assemble widgets, the proportion of defective widgets is known to be 0.04. A robot assembled 500 widgets and 12 of them were defective. Is there evidence to support the hypothesis that robots are better at assembling widgets? If so, at which significance levels is the evidence statistically significant?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture