STAT151 Lecture Notes - Lecture 1: Quartile, Null Hypothesis, Scatter Plot

• School: University of Alberta
• Department: Statistics
• Course: STAT151
• Professor: Alireza Simchi

Document Summary

Statistics is science of how to collect, summarize, analyze, present, and interpret data: and making decisions on them. Three main aspects of stats: design how to obtain data chapters 9-11, data must represent population, description methods to describe data chapters 2-8. Inference making decisions and predictions based on data chapters 16-25: probability chance of statistic being accurate chapters 12-15. Inferences statements about population based on sample. 5 (cid:449)"s: who what where when why. Chapter 2 focuses on categorizing categorical variables. Observational study independent variable is not controlled by researcher. Experimental study independent variable is controlled by researcher. Volunteer sample people have strong feeling for study, and therefore gives bias a study. Lurking or confounding variables might affect results. Cannot make casual inference in observational study* Might be able to make casual inference to population only in randomized experiment. Relative frequency proportion of all data. Pareto diagram bar chart largest to smallest. Segmented bar chart one on top of another.