Lab 1 Worksheet

Activity 1:  Independent & Dependent Variables

  1. After reading about independent and dependent variables on Canvas, test your understanding by providing the independent and dependent variable for the following scenarios:
  1.  Measuring temperatures of young adults and seniors to see if there is a difference based on age.

Dependent variable:                                        Independent variable:

  • Determining if gender has an effect on % body fat of male and female students in the class.

Dependent variable:                                        Independent variable:

  • Exploring the relationship between exam scores and the time spent studying.

Dependent variable:                                        Independent variable:

Activity 2:  Homeostasis

You are outside on a very cold day and your body temperature begins to drop below 36°C, falling outside the normal range.

 Fill-in the following, to show what occurs in your body to maintain temperature homeostasis.

            Normal range body temp:______________________­­­__           Set point:________________



(What is the stimulus in this scenario?)


(What is the sensor for temperature in the body?)

Integrating center:______________________

(Which part of the body serves as the integrating center for temperature?) Be specific.


(What is/are the effectors that can respond?)  Can you find two?


(What is the response of the effectors and how does this affect body temperature?)

Conclusions: Summarize what the purpose of this negative feedback mechanism is in the body.

List at least three other homeostatic conditions that humans must maintain other than temperature.




Activity 3:  Allometric Relationships

1.         Make an observation and form a hypothesis: Pick a body measurement from the list below that you believe corresponds to height. Then formulate a hypothesis that can be tested.

                    a) Observations: State one or more observations related to your scientific inquiry.


b) Hypothesis:Generate a hypothesis and include a justification for your hypothesis.


2.         Collect Data: Place measurement date in the table below.


  Student InitialsHeight   (cm)Foot (cm)Arm (cm)Arm span (cm)Lower Leg (cm)Humerus (cm)Hand (cm)

Enter your individual data in the following google document

3.         View Results: Create a scatter plot graph with trend line and R-squared value.

                        (Place graph here)

– Label the X-axis with your independent variable and include the correct units.

– Label the Y-axis with your dependent variable and include the proper units.

– Label your figure (graph) with an appropriate title.

4.         Statistical Analysis and Conclusion: Does the R-squared value support your hypothesis?  Explain your answer.

5.         List at least three possible sources of error for this experiment.  (Hint: Were there any parts of the experiment that needed more explanation or could have been done differently by different people?)

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