MAT 121 EXAM 1 SG.docx - MAT 121 EXAM 1 STUDY GUIDE TEST DATE SECTIONS 1-1 1-2 1-3 1-4 2-1 2-2 2-3 2-4 SUGGESTED PROBLEMS 1-2 1-35 ODD 1-3 1-31 ODD 1-4

# MAT 121 EXAM 1 SG.docx - MAT 121 EXAM 1 STUDY GUIDE TEST...

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MAT 121 EXAM 1 STUDY GUIDE TEST DATE: 09/21/2015 SECTIONS: 1-1, 1-2, 1-3, 1-4, 2-1, 2-2, 2-3, 2-4 SUGGESTED PROBLEMS: 1-2: 1-35 ODD 1-3: 1-31 ODD 1-4: 1-25 ODD 2-2: 1-31 ODD 2-3: 1-17 ODD 2-4: 1-23 ODD —————————————————————————————————————————— Data - Quantitive (numeric) - Discrete - Has a finite or countable set of possible values. (Infinite but can be put in a list.) - Example: counts - Continuous - Possible values come from an interval of real numbers (No negative square roots or infinity.) - Example: measurements - Categorial (qualitative) - Levels of measurement - 4 (weakest to strongest) - Nominal - Name/category - Examples: color, gender, religion, nationality - Ordinal - Possible values have a natural order, but no meaningful arithmetic with the data - Examples: ranking, letter grades, rate surveys - Interval - Numeric observations - Meaningful - No natural 0 - Examples: Temperate, dates - Ratio - Numeric - Natural 0 - Meaningful - Example: almost all measurements, counting
- Interval vs. Ratio (level of measurement) - Interval - Doesn't have an unambiguous and meaningful zero - No specific zero - Temperature, points in time. - Ratio - Has an unambiguous and meaningful zero - length of time / duration Sampling - Observational study - No attempt to influence the observation - 1. Retrospective study - Case control - Data/observation from the past - 2. Cross sectional study