Circular vs. Linear Statistics
Examine the orientation data displayed below, along with the angles of orientation:
1. Draw an arrow that you think approximates the average angle of orientation.
2. Using linear statistics, calculate the average value of the angles, and draw an arrow that represents that value.
Average Value: ___________
3. How do the arrows you drew in questions 1 and 2 compare with one another? Why might they be different?
4. Now use circular statistics in R to calculate the average angle from the above data. Draw a third arrow that represents this
value. How does this arrow compare to the arrow you drew in question 1?
Constructing the Pulse Magnetizer
1. Once you have built your pulse magnetizer, use the multimeter to record the maximum current it produces, in Amps.
Repeat the measurement three times; record each measure here and then calculate the average current.
a. Measurement 1__________
b. Measurement 2__________
c. Measurement 3__________
d. Average current__________
2. Now use the numbers you recorded above to estimate the strength of the magnetic field inside the coil using the equation
B is the field strength in Tesla (T)
u0 is the permeability of free space (4π × 10−7 T ⋅ m ⋅ A−1)
N is the number of turns (wraps) in the coil
L is the length of the coil in meters (measure with a ruler)
I is the current measured in Amperes (A; average of the three measurements taken)
B = _______________
One of the key skills in the study of animal behavior is the ability to take detailed notes about what you observe. Practicing on
simple behaviors like the orientation of your pill bug is a great way to develop this skill. Practice below by making at least three
observations about the “control” behaviors you observe, and three observations about the “pulsed” behaviors you observe.
These observations can be anything you think is important – be creative and observant!