What types of data do I collect? How do I graph my data to show the results? ?

Data is the measurement of a particular variable. For example, when you measured length during the measurement activity, the variable measured was length, the measurements you collected and recorded were data.

 A variable is an object, event, idea, feeling, time period, or any other type of category you are trying to measure.  For example, if you are collecting data about height, height is a variable. If you are also recording the age and gender of each person, age and gender are also variables.

Variables- an object, event, idea, feeling, time period or any other type of category you are trying to measure. There are two types: 1. Independent 2. Dependent.

 Independent Variable (X-AXIS)  The variable that stands alone  Isn’t changed by other variables  Ex. Age, time  Dependent Variable (Y-AXIS)  Variable that depends on other factors  Ex. Test score depends on study time

Graphs are pictures that help us understand data or numbers we have collected. They help us to see or visualize relationships.

Bar graphs Pie charts Line graphs

 Used to present and compare data  Use rectangles or lines to represent the quantities that occur in a data set  Represent time series data  Each bar represents numerical or categorical values

What data is presented on the x-axis? What data is presented on the y-axis? Which type of music do students like the most? Which type of music do students like the least?

 Are easy to make and easy to read  Represent categorical data or values  Percentages are used to compare the categories with the entire pie equal to 100%

What type of pie is most preferred? What type of pie is least preferred? How many people prefer cherry pie?

 Organize and present data in a clear manner to show relationships and trends  Can be used to forecast data not collected  Comparison between two data sets on the x- axis and y-axis  Common in time series data

Problem 1: Height of bean plants is recorded daily for 2 weeks. What is the independent variable? What is the dependent variable? Problem 2: Seeds are soaked in salt solutions of different concentrations and germination is counted for each concentration. What is the independent variable? What is the dependent variable?

What is the independent variable on this graph? What is the dependent variable on this graph? What is the relationship between the amount of time water is heated and the temperature of the water?