Chapter 1 (Sp11)

# Chapter 1 (Sp11) - Math 1342 Chapter 1 Section 1.1 Basics...

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Math 1342 – Chapter 1 Section 1.1 Basics of Statistics What is the goal of statistics? To learn about a large group by examining data from some of its members. Statistics – the science of collecting, organizing, summarizing, and analyzing information to draw conclusions or answer questions. Data – observations that have been collected (used in drawing a conclusion or making a decision) Population – the entire group of individuals to be studied Sample – A subset of the population being studied (the sample data must be representative of the population from which the data was drawn) Parameter – A numerical summary of the population Ex : The average age of ALL statistics students at Collin. Ex : The median salary of ALL professional basketball players. Statistic – A numerical summary of the sample Ex : The average age of statistics students at Central Park Campus Ex : The average salary of the Dallas Mavericks. Descriptive Statistics – consist of organizing and summarizing data (numerical summaries, tables, graphs) Inferential Statistics – uses methods that take a result from a sample, extend it to the population, and measure the reliability of the result. (we use statistics to estimate parameters) Variables the characteristics of the individuals within the population. TWO TYPES OF VARIABLES : Qualitative Variables – allow for classification of individuals based on some category, attribute, or characteristic. Ex : gender, color, favorite food… Quantitative Variables – provide numerical measures of individuals. Arithmetic operations (add/sub/mult/div) can be performed on the values and will provide meaningful results. Ex

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## This note was uploaded on 01/06/2012 for the course MATH 1342 taught by Professor Lisajuliano during the Spring '12 term at Collins.

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Chapter 1 (Sp11) - Math 1342 Chapter 1 Section 1.1 Basics...

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