ECMT1010 final exam 2012.pdf - Confidential 3910 THE...

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Statistics for the Behavioral Sciences
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Chapter 16 / Exercise 2
Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
Confidential 3910 1 THE UNIVERSITY OF SYDNEYFACULTY OF ARTS &SOCIAL SCIENCESBusiness and Economic Statistics A ECMT1010 Final Exam CONFIDENTIALFamily Name: First Names: Student ID No.: June 2012Time allowed: 120 minutesInstructions -Write your family name, first name(s) and SID on the exam paper (above), answer booklet, and also on the computer card provided. -The whole exam is worth 50 marks. -Answer all 30 multiple choice questions in Part Aby marking the computer card. Unanswered or incorrect answers are given a mark of zero. -Answer all parts of both questions Part Bin the booklet provided -Do not take this examination paper from the room. -Non-programmable calculators are permitted. -Formulae and statistical tables are provided on pages 10-20.
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Statistics for the Behavioral Sciences
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Chapter 16 / Exercise 2
Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
Confidential 3910 2 PART A: MULTIPLE CHOICE QUESTIONS Answer all 30 multiple choice questions 1. Consider the following stem and leaf plot: Stem Leaf 1 0, 2, 5, 7 2 2, 3, 4, 4 3 0, 4, 6, 6, 9 4 5, 8, 8, 9 5 2, 7, 8 Suppose that a frequency distribution was developed from this, and there were 5 classes (10-under 20, 20-under 30, etc.). What is the cumulative frequency for the 30-under 40 class interval?
5
9
2. Chebyshev’s Theorem says that the number of values within 3 standard deviations of the mean will be _______.
3. A commuter travels many kilometres to work each morning. She has timed this trip 5 times during the last month. The time (in minutes) required to make this trip was 44, 39, 41, 35 and 41. The mean time required for this trip was 40 minutes. What is the variance for this sample data?
0
3 4. Meagan Davies manages a portfolio of 200 common stocks. Her staff classified the portfolio stocks by ‘industry sector’ and ‘investment objective’. Investment Industry Sector Objective Electronics Airlines Healthcare Total Growth 100 10 40 Income 20 20 10 Total 120 30 50 If a stock is selected randomly from Meagan’s portfolio, P(Growth|Healthcare) = _____. 150 50 200 A. 0.25 B. 0.40 C. 0.20 D. 0.80
Confidential 3910 3 5. Adam Shapiro, Director of Human Resources, is exploring employee absenteeism at Plain Power Plant. Ten per cent of all plant employees work in the finishing department; 20% of all plant employees are absent excessively; and 7% of all plant employees work in the finishing department and are absent excessively. A plant employee is selected randomly; F is the event ‘works in the finishing department’; and A is the event ‘is absent excessively’. P(A|F) = _____________.
6. One hundred policyholders file claims with StressFree Insurance. Ten of these claims are fraudulent. Claims manager Emma Ropati randomly selects four of the ten claims for thorough investigation. If X represents the number of fraudulent claims in Emma’s sample, X has a _______________.
7.

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