20 Lecture 5 - Midterm Review

20 Lecture 5 - Midterm Review - Lecture5: MidtermReview...

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Lecture 5: Midterm Review
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2 Topics covered 1. Basic concepts 2. Data presentation 3. Descriptive statistics 4. Probability 5. Binomial distribution 6. Normal distribution 7. Sampling distributions
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3 Key distinctions Description vs. inference  Population vs. sample Census vs. sampling Parameter vs. statistic  Sampling vs. non-sampling error  Observational vs. experimental studies  Data types vs. data levels
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4 Data types Quantitative vs. qualitative Continuous vs. discrete quantitative Time series vs. cross-sectional Primary vs. secondary
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5 Data levels 1. Ratio   2. Interval   3. Ordinal  4. Nominal Quantitative Qualitative Decreasing  Complexity Ratio is the highest type!
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6 Frequency distributions Frequency distributions Sturges’ Rule Classes must be exhaustive Classes must be mutually exclusive Four types: Simple frequencies Relative frequencies Cumulative frequencies Cumulative relative frequencies
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7 Graphs Single variable: Numerical Histogram Qualitative Bar chart Pie chart Two variables Numerical Line chart Scatter plot Qualitative Clustered bar chart Stacked bar chart Side-by-side pie  charts
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Stem and leaf (midterm ’05) A survey was conducted to determine how people rated the quality of  programming available on television. Respondents were asked to rate  the overall quality from 0 (no quality at all) to 100 (extremely good  quality). The stem-and-leaf display of the data is shown below. 3| 24 4| 03478999 5| 0112345 6| 12566 7| 01 8|  9| 2 What percentage of the respondents rated overall television quality  with a rating between 50 and 75? a)
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This note was uploaded on 09/25/2010 for the course OMIS OMIS 1000 taught by Professor Alexandershoumarov during the Fall '09 term at York University.

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20 Lecture 5 - Midterm Review - Lecture5: MidtermReview...

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