PSYC 1010 Chapter Notes - Chapter 4: Central Tendency, Standard Deviation, Normal Distribution

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

Document Summary

Module 4 statistical reasoning in everyday life. 68 percent fall within one standard deviation of it) and fewer near the extremes. A skewed distribution (figure 4. 2: 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. Normal curve: scores on aptitude tests tend to form a normal, or bell shaped, curve, for example, the most commonly used intelligence test, the wechsler. Adult intelligence scale, calls the average score 100. In psychological research, proof beyond a reasonable doubt means that the odds of its occurrence by chance are less than 5 percent. When is an observed difference significant: comparing men"s and women"s scores on a laboratory test of aggression, found a gender difference, individuals differ.