PSYB07H3 Lecture Notes - Lecture 1: Sample Size Determination, Human Height
Document Summary
Population: entire collection of events in which you are interested. If you survey the entire population, then population=sample. You study sample statistics and use roman/normal letters for variables. Can be a parameter if based on population or a statistic if based on a sample. Inferential stats: make conclusions about populations from samples. External validity: the degree to which the sample reflects the population. Internal validity: the degree to which the experiment measures what it"s supposed to. Discrete variable: something that can take a limited number of values (y/n) Continuous variable: something that can theoretically take any value along a scale (%) This is a bar graph - used when data is discrete. This is a histogram - used for continuous data. Stem and leaf plots separate the 10"s column and the 1"s column. If you rotate 90* it represents a histogram. Interval - equal distance between values (*c temperature / human height)
