Figure 5.3    
Experimental Investigation: And the Beat Goes On

A.	Question: What is the relationship between   	
 	  and	?

B.	Hypothesis: I think  	

C.	Variables: Independent and Dependent
Independent Variable (IV) _____________________________________
Dependent Variable (DV) ______________________________________

D.	Directions

1.	Work with a partner. Be sure to have a watch with a second hand, and a copy of this worksheet to record data.
2.	Count the number of heartbeats for 1 minute after each activity. Take your pulse at your wrist or throat.
3.	Fill in the information on the “t” table for you and your partner.

Types of Activity	Pulse at rest	Pulse after slow walking	Pulse after quick walking in place	Pulse after jogging in place	
Number of
heartbeats per
minute	Trial no. 1 =
Trial no. 1 = 
Trial no. 1 =	Trial no. 1 =
Trial no. 1 = 
Trial no. 1 =	Trial no. 1 =
Trial no. 1 = 
Trial no. 1 =	Trial no. 1 =
Trial no. 1 = 
Trial no. 1 =	
	
Average =	
Average =	
Average =
	
Average =

E.	
Graph the results from the “t” table by plotting the averages for each activity. Label the x-axis and
y-axis.

																													

																													

																													

																													

																													

																													

																													

F.	Describe the results (three sentences)
1.	Write (or orally share) what you did.
2.	Look at the graph, describe in writing (orally) what it says, tell its story.
3.	Describe what you found out about the relationship between	and	.
4.	Describe the relationship between the IV and DV.

G.	Write the conclusion (three sentences)
1.	Restate the question and describe the relationship between the IV and DV.
2.	Restate the hypothesis and what was found.
3.	Explain the outcome of the experiment.