PSYC 1010 Lecture Notes - Lecture 4: Standard Deviation, Percentile, Symmetry In Biology

• School: York University
• Department: Psychology
• Course: PSYC 1010
• Professor: Jill Bee Rich

Document Summary

Number that best represents the best approximation of the data. How much the scores spread out from the central mean: this is error analysis. Range: subtract lowest score from the highest score, any and all outliers will influence the scores. Standard deviation measures the average spread of scores (deviation from the mean: takes into account all scores in the distribution, greater the variability, the greater the standard deviation (s. d. ) The mean, median and mode will all be the same value. Bilateral symmetry - bell curve: stay to the right of the bell mr. larry tub-o-diabetic-lard schincariol. Important in psychology because most psychological variables (variables psychologists measure a lot) are normally distributed when a large sample is used. Percentile scores: percentage of people who score at or below your own score. Also allows us to have a certain degree of precision: how many people will fall within certain variations from the mean.