6. A hiker walks 4 km north and then 5 km northeast.Draw displacement vectors representing the hikerstrip and draw a vector that represents the hikers netdisplacement from the starting point.

Statistics Math 181, Spring 2016 Statistics is the science of gathering, describing, and analyzing data. Statistics are also the numerical descriptions of data. Population= all of the people/things that one is trying to learn about Sample = a group of the population from which data is collected (the Sample is a group from the Population) Population vs. Sample ● Whole group ● Part of the group ● Want to know about ● Do know about ● Characteristics = Parameters ● Characteristics = Statistics ● Parameters = fixed & unknown ● Statistics are known & can change Data= Measurements, Counts, or Observations gathered in regards to a specific variable in a population. Variable= a value/characteristic that changes among population members Census= a study in which data is obtained from every member of the population Parameter= a numerical description of a population characteristic(s) Statistic= numerical descriptions of sample characteristic(s) Branches of Statistics Descriptive Statistigather, sort, summarize, and display data. Inferential Statistiinvolves using descriptive statistics to estimate population parameters. Data Qualitative Data(QL) = categorical da(this includes descriptions/qualities) Quantitative Data(QN) = numerical data(measurements, counts, & other quantities) Quantitative da