PSYC 218 Lecture Notes - Lecture 2: Squared Deviations From The Mean, Normal Distribution, Percentile
Document Summary
Mode: the most frequent value or score, a bimodal distribution can sometimes indicate that your data come from two different underlying samples (example: female and male ants, disadvantage. Sum of all scores divided by the total number of scores: mean of sample "x-bar, mean of population is "mew" Outliers: highly atypical scores, possible solutions, report the median, report the mean with outliers removed - common strategy when outlier is likely due to measurement error. Median compared to the mean: advantage: less sensitive to extreme scores than the mean, disadvantage: more sensitive to sampling variability compared to the mean. Range: highest score - lowest score, advantage: easy to calculate, disadvantage: ignores shape of distribution. Deviation: deviation score - the amount that a score in a sample differs from the mean of the sample, deviations can tell us how spread out the scores are. Standard deviation and variance: variance: the average of the squared deviations from the mean.
