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1、MA4125 Computer Aided Data Analysis Autumn 2003/2004 Dr. Ailish Hannigan UNIVERSITY of LIMERICKOLLSCOIL LUIMNIGHCOLLEGE OF INFORMATICS AND ELECTRONICSEND OF SEMESTER ASSESSMENT PAPERMODULE CODE: MA4125SEMESTER: Autumn 2003/2004 MODULE TITLE:Computer AidedDURATION: 2 hours Data AnalysisLECTURER:Dr. A
2、ilish HanniganEXTERNAL EXAMINER: Prof. P.J. BolandINSTRUCTIONS TO CANDIDATES:Answer any 4 questions (each question is worth 20 marks). Calculators may be used. This exam is worth 60% of your final grade._Q1. (a) What is the aim of research? What makes research in business different from other types
3、of research? (4 marks)(b) Distinguish between empirical research and theoretical research. What are the phases of the research process? (6 marks)(c) A researcher wanted to find out how long, on average, Internet users in Ireland spent on-line per week. Visitors to the website of an Irish on-line ser
4、vice provider were asked to fill in a brief questionnaire stating how long they spent on-line per week. 100 visitors to the website filled in the questionnaire and on average, they spent 10 hours per week on-line. (i) Identify the population, the sampling method and the sample in this study. (ii) Wh
5、at is the variable of interest in this study? (iii) What is the main parameter of interest in this study? (iv) What is the best estimate of this parameter?(v) Describe the potential bias in this study.(10 marks)Q2. A survey of a banks credit card customers was carried out to establish the levels of
6、personal debt of the customers. Data on the following variables were collected from a sample of 60 customers:Amount: (s) amount currently owed on your credit cardAge group: 1 = under 35 and 2 = 35 or older Gender: 1=male, 2=femaleOtherln: Other personal loans for example car and holiday loans where
7、1=none, 2=loans less than or equal to 10,000 and 3=loans greater than 10,000 Using the following output from SPSS:(a) Write a newspaper report (suitable for a general audience).(8 marks)(b) Write a detailed statistical report. (12 marks)(Question 2 contd.)(Question 2 contd.)(Question 2 contd.)(Quest
8、ion 2 contd.)Q3. (a) Four questions from a questionnaire used in a graduate employment survey are as follows:Q1. Are you MaleFemale ?Q2. How much do you earn per year?Under 15,00015,000 30,00030,000 45,00045,000 60,00060,000 + Q3. Rate the relevance of your degree to your chosen career on a scale of
9、 0 to 10 where 0 is “no relevance”. Q4. How many years post-graduate experience have you? Classify the data generated for each of the above questions by data type and scale of measurement.(6 marks) (B) STATISTICAL ERRORS CAN OCCUR IN THE PLANNING, DESIGN, EXECUTION AND ANALYSIS OF A STUDY AND IN THE
10、 PRESENTATION AND INTERPRETATION OF THE RESULTS. DISCUSS WITH REFERENCE TO AT LEAST EIGHT COMMON STATISTICAL ERRORS. (8 marks)(c) Correlation and regression are among the most commonly used statistical tools. Write a note on cautions about the use and interpretation of these tools.(6 marks)Q4. (a) D
11、efine a p-value.(2 marks)(b) A hypothesis test was carried out to investigate if there was a difference between the mean hourly wage (s) of non-Irish nationals and Irish nationals working in the service industry. Write a statistical report on the results of the analysis using the output from SPSS be
12、low. (10 marks)(Question 4 contd.)Independent Samples Test Levenes Test for Equality of Variances t-test for Equality of Means FSig.tdfSig. (2-tailed)Mean DifferenceStd. Error Difference95% Confidence Interval of the Difference LowerUpperPAYEqual variances assumed17.111.0014.90318.0001.2556.2561.717
13、61.7935 Equal variances not assumed 5.36611.858.0001.2556.2340.74501.7661(b) An estate agent claims that the average monthly rent for a two-bedroom apartment in Limerick is 600. A random sample of 40 advertisements for two-bedroom apartments in the local newspaper was selected. The monthly rents advertised were summarised using SPSS and a hypothesis test was carried out to investigate the estate agents claim. Assume the data are normally distributed. Write a statistical report on the results of the analysis using the output below.(8 m
