215 Handout_3(chap3-4) - Handout #3: Producing Data...

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Handout #3: Producing Data (Chapter 3-4) STA215: Introductory Applied Statistics Dr. Jann-Huei Jinn Suggested Exercises: 3.4 , 3.6, 3.7, 3.8, 3.9, 3.10, 3.15, 3.18, 3.19, 3.24(a), 4.1, 4.3, 4.4, 4.5, 4.9, 4.10, 4.11, 4.23, 4.26, 4.29, 4.38, 4.46, 4.49 Read Chapter 3, 4 The Fundamental Rule for Using Data for Inference (page 72) Population: (page 73) A population consists of all elements - individuals, items, or objects – whose characteristics are being studied. Sample: A portion of population selected for study is referred as a sample. Example (Exercise 3.4, 3.6) Simple Random Sample: A sample that is selected in such a way that each member of the population has equal chance of being selected in the sample. Example 3.6 (Use a Random Digits table to select SRS) Advantages of a Sample Over a Census: a. Census isn’t possible and time consuming b. Speed c. Accuracy Conservative Margin of Error: For about 95% of all sample proportion found in properly conducted sample surveys, the conservative margin of error is × n 1 100%. Example 3.3, 3.4, 3.5 (page 77-78), Exercise 3.18, 3.19 Other Sampling Methods: BAD Samples: voluntary response sample, convenience sample (page 93-94, Example 3.10) These sampling methods display bias, or systematic error, in favoring some parts of the population over others. GOOD samples:
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215 Handout_3(chap3-4) - Handout #3: Producing Data...

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