PSYC1101 Lecture Notes - Lecture 11: Effect Size, Australian Psychological Society, Standard Deviation
Document Summary
Descriptive statistics: allows us to summarise and describe the characteristics of a distribution. Measures of central tendency: mean: arithmetic average of a set of scores. Captures information from every score: greatly affected by outlier scores, mode: most frequently occurring score in distribution, median: the point that divides the distribution of scores in half when scores are arranged when ordered from lowest to highest. Standard deviation: takes into account how much each score in a distribution differs from the mean, greater variability=greater standard deviation (sd) The more numbers vary from the mean, the less representative the mean is from the data. The greater the standard deviation the less representative the mean. Calculating standard deviation: when you know the scores of the entire population: What you know the scores of a sample of the population: Tells us how confident we can be in making inferences about a population, based on the sample.
