2Leading Questions What is statistics? What type of math is used in statistics?Why do we use statistics?Where are stats used in the world?What jobs use stats?
3DefinitionsStatistics – the study of how to collect, organize, analyze and interpret numerical information from dataIndividuals are the people or objects included in the studyA variable is the characteristic of the individual to be measured or observed.
4Types of variablesQuantitative – has a value or numerical measurement for which operations such as addition or averaging makes senseEx. Scale of 1 – 5; age; weight; distance; height; etc.
5Types of variablesQualitative – describes an individual by categorizing or groupingEx. Male vs. female; hair color; city; religion; type of building; yes or no; etc.
6Types of dataPopulation data – the variable is from every individual of interestSample data – the variable is from only some of the individuals of interest.
7Class ExampleWhat is a study that someone would conduct and use our class to interview for information toward the study.Name the individuals and variables, is it qualitative or quantitative; Who would be the pop. And who would be the sample?
8Guided Exercise 1: pg. 6Television station QUE wants to know the proportion of TV owners in Virginia who watch the station’s new program at least once a week. The station asked a group of 1,000 TV owners in Virginia if they watch the program at least once a week.
9G.E. #1 QuestionsIdentify the individuals of the study and the variableDo the data compromise a sample? What’s the population?Is the variable qualitative or quantitative?Give an example of the other that could be of interest.
10Levels of measurement Nominal – names only Bill is a BaptistOrdinal – can be ordered, but the differences are meaninglessSara is 7th in her classInterval – meaningful difference between data value, but not a starting pointThe temperatures in JulyRatio – includes an inherent zeroSam earned $567 in May
11Guided Exercise #2: page 9 Give the level of measurement for each of the following.The senator’s name is Sam Wilson.The senator is 58 years old.The senator was elected in 1980, 1986, 1992, 1998.The senator is married.
12Guided Exercise #2: page 9 A leading news magazine claims the senator is ranked 7th for his voting record on bills regarding public education.His total income last year was 878,