1a - chapter 1 part a - Chapter 1 Part A: Variables and...

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- ١ - Chapter 1 – Part A: Variables and Data Types: a. Definition : [Page 29 # 2] i. We can have one or more variables in any statistical study. ii. Each variable assume many values iii. The data is the set of all these values. b. Population or sample ? <Page 26: # 4, 5> [Page 29 # 16, 17, 18] i. The data can be collected from the population (all subjects under study). ii. But usually it's collected from a sample (group of subjects selected from the population) to save time and expense or if population is infinite. c. Data Types : < Page 26: #. 8> [Page 29 # 5, 6, 8, 24] i. Qualitative (or categorical): Characteristic values (non-numerical) that can be categorized like: major, gender, geographic area, religion, zip code, marital status, color, Course grade (A, B, C, D, F), size [small, medium, large], performance (poor, average, good) …etc. ii. Quantitative: (Numerical values) < Page 27: # 9> 1. Discrete: Each value is a counted number like 0, 1, 2 …etc. Examples: TOEFL, IQ scores , Exam grade, number of students, number of children, and number of calls . 2.
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1a - chapter 1 part a - Chapter 1 Part A: Variables and...

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