Graphs In your textbook this is from section 1.4 in your textbook

Data Tables Scientists organize their data by using tables and graphs A data table is a very easy way to present and organize data On p. 22 in your textbook is an example of a data table This table has location and average annual precipitation for several cities

Data Tables On this particular table the location is the manipulated variable (what we know as the independent variable) The average annual precipitation is the responding variable (what we know as the dependent variable)

Line Graphs A line graph can be used to show changes that happen when the two variable are related The independent variable is graphed along the x-axis (the horizontal axis) The dependent variable is graphed along the y-axis (the vertical axis)

Line Graph

Slope When looking at a line graph it is important to notice the slope which is the ratio of the vertical change to the corresponding horizontal change Slope = rise/run Rise is the change in the y variable Run is the corresponding change in the x variable p. 23 in your text has an example of mass vs. volume of water

Direct and Inverse Proportion Direct proportion is when the ratio of the two variables is constant This can be seen in the mass vs. volume of water graph Inverse proportion is when the product of the two variables is a constant This can be seen in the Time to fill a 1-gallon pot with water graph

Bar Graphs A bar graph is used to compare a set of measurements, amounts or changes P. 24 in your text has an example of the Average Annual Precipitation for Selected U.S. Cities Notice how it is easy to see the precipitation differences between each city

Bar Graph

Circle Graphs A circle graph shows how a part or share of something relates to the whole An example of a circle graph can be seen on p. 24 in your textbook This circle graph shows the Composition of the Earth’s crust (shows the percent of elements in the Earth’s crust)

Circle Graph (also known as pie graph)

Presenting Data Scientists need to present the results of their experiments in scientific journals or magazines Data can be interpreted in different ways Advertisers often use tables and charts to make their product look better to us Data needs to be presented clearly and honestly