Chapter 1 Data Analysis Ch.1 Introduction Statistics: the Science and art of Data

Data Analysis IDENTIFY the individuals and variables in a set of data. CLASSIFY variables as categorical or quantitative.

Organizing Data Statistics is the science and art of collecting, analyzing, and drawing conclusions from data.

Organizing Data Statistics is the science and art of collecting, analyzing, and drawing conclusions from data. An individual is an object described in a set of data. Individuals can be people, animals, or things.

Organizing Data Statistics is the science and art of collecting, analyzing, and drawing conclusions from data. An individual is an object described in a set of data. Individuals can be people, animals, or things. Variable - an attribute that can take different values for different individuals

Organizing Data Statistics is the science and art of collecting, analyzing, and drawing conclusions from data. An individual is an object described in a set of data. Individuals can be people, animals, or things. Variable - an attribute that can take different values for different individuals Categorical Variable assigns labels that place each individual into a particular group, called a category. Quantitative Variable takes number values that are quantities—counts or measurements.

Analyzing Data A variable generally takes values that vary. We are interested in the pattern of that variation.

Analyzing Data A variable generally takes values that vary. We are interested in the pattern of that variation. Distribution tells us what values a variable takes and how often it takes those values.

Analyzing Data

Analyzing Data Categorical variable “Preferred communication method”

Analyzing Data Categorical variable “Preferred communication method” Bar graph of “Preferred communication method”

Analyzing Data Quantitative variable “Number of languages spoken”

Analyzing Data Quantitative variable “Number of languages spoken” Dot plot of “Number of languages spoken”

How to Analyze Data Examine each variable by itself. Then study relationships among the variables.

How to Analyze Data Examine each variable by itself. Then study relationships among the variables. Start with graphs

How to Analyze Data Examine each variable by itself. Then study relationships among the variables. Start with graphs Add numerical summaries

From Data Analysis to Inference Population

From Data Analysis to Inference Population Sample

From Data Analysis to Inference Population Sample Collect data from a representative sample...

From Data Analysis to Inference Population Sample Collect data from a representative sample... Perform data analysis…

From Data Analysis to Inference Population Sample Collect data from a representative sample... Make an inference about the population. Perform data analysis…

Section Summary IDENTIFY the individuals and variables in a set of data. CLASSIFY variables as categorical or quantitative.

In Class Activity Page 7: Read and discuss the narrative about pilots.

In Class Activity Page 7 Read and discuss the narrative about pilots.

Assignment Page 7-8 #2-10 even (2, 4, 6, 8, 10) If you are stuck on any of these, look at the odd before or after and the answer in the back of your book. If you are still not sure text a friend or me for help (before 8pm). Read 1.1 page 9-24 Tomorrow we will check homework and discuss section 1.1.