1. Bell Ringer
Ling wants to see if caffeine raises the heart rate in mice. Identify the independent and dependent variables.
If you haven’t already, turn in Student Info forms and/or Sci Method WS

2. Measurement and Graphing

3. Measuring Data Science relies on collecting and analyzing data
Qualitative data – describing observations (Qualitative data describes the quality)
Examples: colors, textures, smells
Quantitative data – data that can be measured (Quantitative data measures the quantity)
Examples: length, speed, time, temperature

4. Measuring Data Quantitative data is measured using the metric system
Universal (understood internationally)
Based on units of 10
Countries that do NOT currently use the metric system:

5. Measuring Data Different base units for different measurements
Base units do not have prefixes in front of them (so they will be one letter)
Base Unit
Symbol
Measures
Meter m
Length
Gram g
Mass
Liter L
Liquid Volume
Second s
Time

6. Measuring Data Metric System Prefixes:
Prefixes (come before the base unit) are used for more specific measurements
Metric System Prefixes:
Larger than base: kilo, hecto, deca
Smaller than base: deci, centi, milli
Susie:
1.64 meters
164 centimeters
kilometers

7. Graphs Graph – visual display of information or data
Organizes data, making it easier to detect trends or patterns
Used to show comparisons between data within an experiment

8. Three types of graphs:
Line graphs -- show how two experimental variables are related, most common graph we’ll use in class
Bar graphs – compare information collected by counting
Pie charts – show data as parts of a whole

9. How to Graph Step 1 -- Determine the variables and label each axis
Always include units!
Plant Growth
(cm)
Amount of Water
(mL)

10. How to Graph Step 2 -- Determine the scale of the graph
Determine the number value for each square on the graph
The scale does not have to begin with zero
Your scale must be even and continuous! Count by 2s, 5s, 10s, etc.
Spread the graph out to take up the most equal amount of space

11. How to Graph
Step 3 -- Plot the data points, marking each data value with a dot
Step 4 -- Draw the line
Does not have to be a straight line
If there is more than one line on the graph, you must a key
Step 5 -- Give the graph a descriptive title

12. Area of Mold Growth (cm2)
A student is interested in how humidity (the amount of water vapor in the air) affects the amount of mold that grows on beakers in the laboratory. He gathers the following data:
% Humidity
Area of Mold Growth (cm2) 5% 40
13% 58
19% 75
25% 94
30%
120
Which type of graph should I use? Why?

13. Area of Mold Growth (cm2)
% Humidity
Area of Mold Growth (cm2) 5% 40
13% 58
19% 75
25% 94
30%
120

15. Today
Work on graphing activity individually. If you have questions, ask me or your tablemate. You are not, however, working together. Turn in to the front basket.
Each person needs a Review WS. This covers the first three days of notes (Ch 1). You may work together on this, but each person needs their own sheet.