PSYCH 1X03 Lecture Notes - Lecture 1: Statistical Significance, Statistical Inference, Descriptive Statistics
5 Sep 2016
School
Department
Course
Professor
Document Summary
Descriptive statistics present info of data at a glance, to give an overall description of data (mean median mode: pie charts, bar graphs, and venn diagrams. Mean: average of a data set, extremely susceptibly to outliers (extreme points, distant) Mode: value that appears most frequently, also for non-numerical data set. Median: centre value of data set when set is arranged numerically: eliminate highest and lowest numbers (centre, or mean of two centre, will not be affected by an outlier. Standard deviation: average distance of each data point from mean: smaller spread (smaller stdev), larger spread (larger stdev) Inferential statistics: statistics that allow us to use results from samples to make inferences about overall, underlying populations. Alternate populations: no effect means both groups belong to same population, but if it does has effect then experimental group belongs to a different population.
