STAT1008_final_exam_Sem_2_2006

STAT1008_final_exam_Sem_2_2006 - THE AUSTRALIAN NATIONAL...

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Page 1 of 12 THE AUSTRALIAN NATIONAL UNIVERSITY SCHOOL OF FINANCE AND APPLIED STATISTICS Second Semester Final Examination, November 2006 QUANTITATIVE RESEARCH METHODS (STAT1008) Study Period: 15 minutes Time Allowed: 3 hours Permitted Material: Calculator, dictionary and 1 A4 page with notes on both sides Instructions to Candidates: Attempt ALL questions. Each question is of equal mark value. Start your solution to each question on a new page. To ensure full marks show all the steps in working out your solution. Marks may be deducted for failure to show appropriate calculations or formulae. Unless otherwise stated, use a significance level of 5%. Selected statistical tables are attached to the back of the examination paper.
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STAT1008 Quantitative Research Methods Final Examination Semester 2, 2006 Page 2 of 12 Question 1: 20 marks For each question below, choose the best answer from the options given. Write your answer in your answer booklet clearly indicating the question (i to xx), and your answer as the letter appropriate (A, B, C, or D). You will gain 1 mark for each correct answer. Marks will not be deducted for incorrect answers. i. Statistics can be best defined as which of the following: a. A framework for dealing with variability b. A set of tools for answering questions c. A subject in which no answer is ever right d. A system of obscuring the facts and data by using formulae. ii. If we wish to examine if it is possible that a linear relationship exists between two continuous variables, which of the following methods is most appropriate? a. Simple linear regression b. Multiple linear regression c. 1 sample t-test d. 2 sample t-test iii. The heights of a group of men are taken, with a sample standard deviation found to be 2.8cm. The heights of a group of women are taken, and the sample standard deviation is found to be 4.3cm. Which of the following statements is true? a. There is a significant difference in the population variances of the heights of men and women. b. There is no significant difference in the population variances of the heights of men and women. c. The average heights of men and women are different. d. We need more information about the study performed before we can make any comments. iv. The central limit theorem ensures that which of the following statements is true, given sufficient observations? a. The standard deviation gets smaller as sample size increases. b. The sample mean gets smaller as sample size increases. c. The standard error of the sample mean gets smaller as sample size increases. d. The standard error of the sample mean follows a normal distribution. v. If two events, A and B, are mutually exclusive, which of the following is true? a. P(A)+P(B)=1 b. P(A)+P(B)=0 c. P(A B)=1 d. P(A B)=0 Questions (vi) to (xx) relate to the following situation. Use the information given below to answer the questions.
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This note was uploaded on 10/13/2011 for the course STAT 1008 taught by Professor Miss during the Three '11 term at Australian National University.

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STAT1008_final_exam_Sem_2_2006 - THE AUSTRALIAN NATIONAL...

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