# Exp. 03 – Introduction to Data Analysis

### Why are we doing this experiment?

• Writing a procedure allows students to analyze a situation and consider the options for finding the answer to the questions. It also encourages students to think about the entire process rather than just following what someone else has written.
• Understanding density will allow students to understand phenomenon they see in the world from the simple (ice floating on water) to the more complex (determining the correct amount of ballast so that a ship will float, not sink).
• Density is a derived unit, as such it can be used for unit conversions and manipulations.

### What will I do in lab?

• Technique Videos to Watch
• Using an Analytical Balance
• Safety
• SDS Sheets
• Common Errors in Lab
• Using incorrect glassware (type and/or size)
• Improper reading of volumes on glassware (see technique videos)
• Using a single piece of foil or several pieces of the same size (think about what the graph would look like if the data points were all the same or very similar)

### What will I do after lab?

Percent Error

• Post-lab Checklist (i.e. things you should be able to do for the lab practical)
• Write a procedure to meet the outlined objectives and complete the data analysis calculations
• Use basic laboratory equipment and glassware to collect the needed data including correct use of analytical balance and graduated cylinder.
• Determine the density of a sample using mathematical and graphical methods.
• Calculate standard deviation and percent error.