STA 2023 Lecture Notes - Lecture 1: Standard Deviation, Categorical Variable, Scatter Plot
Document Summary
Random sampling each member of the population has the same chance of being included in the sample; tend to be representative of the population. Sample subjects for whom we have data. Variables the characteristics that we measure on each subject; can take on different values for each individual. Subjects persons, animals, or objects in our study/experiment. What is statistics? the art and science of learning from data; designing studies, analyzing data, and translating data into knowledge and understanding of the world around us. Design plan how to obtain the data/ tells us how data was collected. Description summarize the data with graphs / summarizes data from the sample. Inference use data from a random and representative sample to draw conclusions about the population of interest. Categorical variables place observations into groups, usually summarized by the percentage ex. favorite sport, which county lived in, zip-codes. Quantitative variables numerical values ex. how much exercise in one week.
