BSS 621_PRACTICE QUESTIONS_PART1.pdf

BSS 621_PRACTICE QUESTIONS_PART1.pdf - RICHFIELD GRADUATE...

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Page 1 of 8 This paper consists of 3 questions of 5 pages including this page and formula sheet. SUGGESTED TIME REQUIRED TO ANSWER THIS QUESTION PAPER NUMBERS QUESTIONS MARKS TIME IN MINUTES SECTION A: COMPULSORY 1 Question One 25 30 SECTION B: COMPULSORY 2 Question Two 25 30 SECTION C: ANSWER ANY TWO QUESTIONS 3 Question Three 25 30 4 Question Four 25 30 5 Question Five 25 30 TOTAL 100 120 RICHFIELD GRADUATE INSTITUTE OF TECHNOLOGY (PTY) LTD HIGHER EDUCATION AND TRAINING DEPARTMENT OF STATISTICS BUSINESS STATISTICS 621
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Page 2 of 8 QUESTION ONE Choose the correct alternative for each of the questions/statements and write down the alphabet corresponding to your choice next to the question number in the answer sheet provided. 1.1 Identify the correct statement about inferential statistics. (1) A. In inferential statistics, we study the methods to make decisions about population based on sample results B. In inferential statistics, we study how to make decisions about mean, median, or mode C. In inferential statistics, we study how a sample is obtained from a population D. None of the above 1.2 In statistics, a sample means__________. (1) A. a portion of the sample B. a portion of the population C. all items under investigation D. None of the above. 1.3 Which of the following options is the measure of dispersion? (1) A. The range B. 50 th percentile C. Inter-Quartile range D. Variance 1.4 Which branch of statistics deals with the techniques that are used to organize, summarize, and present the data? (1) A. Advanced statistics B. Probability statistics C. Inferential statistics D. Descriptive statistics 1.5 You asked five of your classmates about their height. On the basis of this information, you stated that the average height of all students in your university or college is 67 inches. This is an example of_______. (2) A. descriptive statistics B. inferential statistics C. parameter D. population 1.6 When data are collected in a statistical study for only a portion or subset of all elements of interest we are using________. (1) A. a sample B. a parameter C. a population D. both B and C
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