PSYC 1010 Lecture Notes - Lecture 4: Wechsler Adult Intelligence Scale, Normal Distribution, Central Tendency

• School: York University
• Department: Psychology
• Course: PSYC 1010
• Professor: Rebecca Jubis

Document Summary

Casual estimates often misread reality and misinform. Presentation of statistical information needs more transparency. Measures of central tendency include a single score, represents a set of scores. Most frequently occurring score(s) in a distribution. Arithmetic average of a distribution, obtained by adding scores and then dividing by the number of scores; can be distorted by few atypical scores. Middle score in a distribution; half scores are above it, half are below it. This graphic representation of the distribution of a village"s incomes illustrates three measures of central tendency: mode, median, mean. note how just a few high incomes make the mean, fulcrum point that balances the incomes above/below, deceptively high. Measures of variation reveal similarity or diversity in scores. Range: difference between the highest and lowest scores in a distribution. Standard deviation: computed measure, how scores vary around mean score.