Name: ______Date: ______

Period:123456

Graphing Practice Lab: Height vs Arm Span

Pre-Lab

Variables and Hypothesis:

  1. Use the following question:

“What isthe effect of a person’s height on their arm span?”

  1. What is the manipulated variable (what you can manipulate or change)?
  1. What is the responding variable (what responds or reacts to that change)?
  1. What are some controlled variables (cv)? (take a guess!)
  1. Write a hypothesis to answer the research question.
  2. Remember to use “If…then…because…”

Procedure:

  1. Write down what materials you plan to use.
  1. What can you do to not accidentally increase your measurements for height?
  1. What can you do to not accidentallyincrease your measurements for arm span?
  1. Write a procedure that describes how you will test your hypothesis.

Data Collection:

  1. Gather data from yourself and your partner.
  • Note: height and arm span are rounded to the nearest Centimeter

Name of Student / Height (cm) / Arm Span (cm)
  1. Enter your data onto the class Data Sheet under the DocCam.

Data Analysis:

  1. With the class, go through the steps of figuring out how to scale your graph.
  2. Step 1: Which is your manipulated variable? (circle one)

Height Arm Span

  • Step 2: Ms. Grant will organize the class data from smallest to largest.
  • Step 3: What is the largest data point (the maximum)? ______
  • Step 4: What is the smallest data point (the minimum)? ______
  • Step 5: How big of a difference(range) is there between the largest number (maximum) and the smallest number (minimum)?

Maximum -Minimum=Range (difference)

______- ______= ______

  • Step 6: How many boxes are there on the X axis (horizontal,----) of your graph paper? ______
  • Step 7: Finding your scale

Range (from step 5) /Number of squares on the X axis = Scale

______/ ______= ______

  • Step 8: What does your scale round up to? ______
  • Step 9: Each of the boxes on your X axis of your graph is ______!
  1. Now make a graph for your data. Include the following on your graph:
  2. Title (mv vs. rv or “What is the effect of your mv on your rv?”)
  3. Label the X-axis. (with your manipulated variable and units)
  4. Label the Y-axis. (with your responding variable and units)
  5. Scale your data for your axis. (Use the information from # 12!)
  6. Plot your data points.
  7. Draw a trend line (best fit) through your data points. (Make sure they have an equal number of data points above and below the trend line.)

______

Conclusion:

  1. Write a conclusion including the following:
  2. Restate your hypothesis.
  3. In a complete sentence, state whether your data supported or did not support your hypothesis.
  4. Support your statement with evidence. Include the range for your manipulated variable (the highest and lowest).
  5. In a complete sentence use a scientific explanation to describe why the responding variable changed in the way that it did.
  6. In a complete sentence explain what might have gone wrong in the experiment.
  7. In a complete sentence explain how you could modify your experiment to fix this error.