PSY 100 Lecture 3: Psychology Notes ch 3
Document Summary
Descriptive statistics: describe various aspects of the data. Inferential statistics: use probability to make decisions about which results might have occurred through chance variation. Mode: the score that occurs more often than others. Meridian: put the scores in order, find the middle score that seperates the upper and lower half of distribution (this is the median). If have an even number of scores, take the average of the two middle scores. Mean: average score (sum of scores divided by the total number of scores) Range: difference between highest and lowest scores in the distribution. Standard deviation: represents an average difference between the scores and their mean (but not equal to true mean difference) Statistical significance: whether a difference is real or due to chance. Effect size: the percentage of variability in scores that is accounted for by the independent variable.
