Stop! Suppose the commuter in Exercise 20 has a 5-day workweek. a) Find the mean and standard deviation of the number of red lights the commuter should expect to hit in her week. b) What assumption did you make about the days? c) Use the mean and standard deviation to describe a typical week. d) Upon arriving home on Friday, the commuter remarks, Wow! My commute was quick all week. How many red lights would it take to deserve a feeling of good luck?

Chapter 1 Throughout the semester, we will learn methods to address questions such as these. To get started, we need to learn some basic vocabulary. -Subject: entities that we measure in a study -Variable: any characteristic that is observed for the subject in a study -Population: a set of all subjects of interest -Sample: the set of subjects for which we have data **We want to use the sample’s data to make an inference about the population.** -Statistic: a numerical summary of the sample (known information) -Parameter: a numerical summary of the population (unknown information) There are 3 major components to Statistics: 1. Design of the Study • What is the research question • What is/are the population of interest • What is the