Skip to Main Content

IB Biology - Scientific Investigation (first assessment 2025): Presentation of Data

This guide provides resources for the Scientific Investigation internal assessment task for IB Biology.
Use the international system of units.  No cups, teaspoons, ounces, pounds, inches, feet, or miles.

Data Tables

Britannica ImageQuest - DNA autoradiograms and numbersTitles

Give each data table an explanatory title.  The title should tell the reader about the information in the table.  For example, instead of “Data Table,” write, “Respiration rates of spinach leaves under varying light intensities.”

Units of Measurement and Uncertainty

Write units of measurement and uncertainty in column headings and not next to each measurement.  This makes the table easier to read and allows you to perform calculations within your spreadsheet.

Independent Variable and Dependent Variables

Place the independent variable in the first column.  Dependent variables go in the next columns.

Measurements

Set the decimal points to match the precision of your measurements. See Collection of Data: Precision and Uncertainty.

Make sure calculated numbers such as the mean have the same number of decimal places as the original measurements.

Graphs

Add best fit lines only if you have collect a LOT of data and can have some confidence that the line really represents likely data points.

Column graphs are best for comparing means.

 

Scatter graphs are best when looking for correlation between two variables.

         

West Sound Academy Library | PO Box 807 |16571 Creative Drive NE | Poulsbo, WA 98370 | 360-598-5954 | Contact the librarian