Chapter 1: Getting Started Section 1: Essential question: What is statistics?
Statistics ·the science of collecting, organizing, summarizing, and analyzing information in order to draw conclusions • the study of how to collect, organize, analyze, and interpret numerical information from data
Definitions • Individual: The people or object in a study. • variable – the characteristics of the individual to be measured or observed
Definitions Continued • quantitative variable – has a value or numerical measurement • qualitative variable – describes an individual by placing the individual into a category or group
Definitions Continued • population – the group to be studied • sample – a subset of the population; a collection of some of the elements/ individuals obtained from a population
descriptive statistics – consists of organizing and summarizing the information collected inferential statistics – involves methods of using information from a sample to draw conclusions regarding the population based on the analysis of data Two Branches of Statistics
parameter – descriptive measure of a population statistic – descriptive measure of a sample Measures
The Process of Statistics • Identify the research objective • identify a group to be studied and determine the questions to be answered . • Collect the information needed to answer the questions. • Organize and summarize the information (descriptive statistics). • Draw conclusions from the information (inferential statistics).
Determine if each example would describe a population, sample, individual, variable, parameter, or statistic
1. The average test score for all the students in a statistics class.
2. A farmer randomly selects 100 soybean plants from his crop to measure the weight of the soybeans
5.The average income of 50 randomly selected families located in Harrisburg
6. The weight of each car in a study of the population of all 2002 Honda Civics