1. Independent and Dependent Variables
Biology Homework
Chapter 1

2. Requirements
The following steps are required for each problem on the homework.
Independent Variable
Dependent Variable
Control
Hypothesis (If…Then Statement)
Data Table
Sample Graph (extra credit)

3. Question 1: Light Bulb Temp.
Independent Variable: Light bulb wattage (watts)
Dependent Variable: L.B Temperature (0Celsius)
Controls:
Distance temp. recorded from light bulb.
Room temp. must be consistent.
Time that bulb is turned on.
Brand/Type of bulb is the same.
Use the same lamp.

4. Hypothesis: If we increase the bulb wattage, then the bulb temp
Hypothesis: If we increase the bulb wattage, then the bulb temp. will increase also.
Sample Data Table:
Independent Var.
Dependent Var.
(Bulb Wattage)
(Temperature oC)
40 Watts
60 Watts
75 Watts
100 Watts

5. Sample Graph
Temperature (Celsius)
Bulb Wattage (Watts)