PSYCO104 Lecture Notes - Lecture 3: Statistical Inference, Summary Statistics, Descriptive Statistics

• School: University of Alberta
• Department: Psychology
• Course: PSYCO104
• Professor: Christopher Lepine

Document Summary

Number of participants fall in this category. Summary statistics describe data in just 2 numbers. Describe distribution in terms of a single statistic that"s typical of whole sample: Median: score that divides distribution in half. Sum of all scores divides by number of scores. Issues: affected by extremely high or low scores. Median: number that divides distribution in half, when individual score arranged. Example: median =0 when half people scored below 0 and half people from lowest to highest scored above zero. Advantage: not affected by extreme scores, more representative of the sample when there are extreme scores. Describe distribution in terms of a single statistic that provides information about the spread of the scores in the distribution: Range: difference between highest and lowest scores in distribution. Range may suggest that distribution of scores vary more than they actually do, because it doesn"t take into account the mean of the scores. 2. variance: average of squared deviation scores about the mean.