STAT-S 301 Study Guide - Midterm Guide: Percentile, Quartile, Sd Association
Document Summary
Definitions: borrowing strength: refers to using a model to allow of the data to answer a specific question, categorical variable: identifies cases w/ common, qualitative, attribute. Can be nominal (no natural order) or ordinal (labels have a natural order). Summarize by count/percent per category: numerical variable: identifies cases w/ numerical properties. Independent events: events that do not influence each other: random variable: probabilities for an uncertain outcome of a random process, (x) (x= a possible outcome of a random variable). Rules: bar charts are a way to display categorical data (counts of discrete categories). Should have some order (ex: alphabetical: pie charts display percentages (parts of a whole, histograms are designed for numerical data and show intervals between numbers. If the correlation between x and y is 1, then the point in the scatterplot all lie on a single line with slope sdy/sdx. If a conditional distribution matches its marginal, the 2 variables are not associated.
