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Topic 10

# Topic 10 - POLI 311 Empirical Methods Topic 10 Inferential...

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Click to edit Master subtitle style 11/24/10 POLI 311 | McGill University POLI 311: Empirical Methods Topic 10: Inferential Statistics Estimating Sampling Error

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11/24/10 Review Q: Which measure of central tendency would you choose to describe the distribution of salaries in Canada? 1. The median 2. The mean 3. The mode 4. All of the above 5. None of the above
11/24/10 Which of the following is NOT an example of a descriptive statistic: 1. A frequency distribution 2. A standard deviation 3. An interquartile range 4. All are descriptive statistics 5. None are descriptive statistics

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Click to edit Master subtitle style 11/24/10 POLI 311 | McGill University Topic 10: Inferential Statistics Estimating Sampling Error Estimating Confidence Intervals Around a Sample Proportion Overview Estimating Confidence Intervals Around a Sample Mean Estimating Sample Size Interpreting Normal Distribution
Click to edit Master subtitle style 11/24/10 POLI 311 | McGill University Interpreting a Normal Distribution Topic 10: Inferential Statistics Estimating Sampling Error The normal distribution takes the form of a symmetrical bell-shaped curve . The mean, median and mode of normally distributed data coincide with the highest point of the curve.

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Click to edit Master subtitle style 11/24/10 POLI 311 | McGill University Interpreting a Normal Distribution Topic 10: Inferential Statistics Estimating Sampling Error IF data are normally distributed, 68.3% of the cases will fall within one standard deviation of the mean of the distribution, 95.5% of the cases will fall within 2 standard deviations of the mean, and 99.7% of the cases will fall within 3 standard deviations of the mean.
Click to edit Master subtitle style 11/24/10 POLI 311 | McGill University Interpreting a Normal Distribution Topic 10: Inferential Statistics Estimating Sampling Error The mean IQ is 100 and the SD is 15

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11/24/10 The average height of women is 5 feet 5 inches and the standard deviation is 2 inches. If
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