Mass Reliability & Validity

schmied/reid©2007 all rights reserved!

Use this handout as a draft guideline for your work. Answer the following questions in complete, quality

and correct sentences reflecting each question on separate paper.

 

1. Create a properly formatted scientific question for this experiment.

 

2. What is the Manipulated (experimental) variable in this experiment?

 

3. Describe the Responding (measured) Variable.

 

4. Create an appropriate prediction for this question. (If Then FORMAT)

 

5. Develop an appropriate hypothesis (prediction with a reason) for the above question. (If Then Because FORMAT)

 

6. Provide a complete, numbered list of all materials used in this experiment.

 a. Part A Materials

b. Part B Materials

 

7. Identify the control trials. Tell why these were chosen as the controls.

a. Controls Part A

b. Controls Part B

 

8. Identify the experimental trials. Tell why these were chosen as the experimental trials.

a. Exp Trials Part A

b. Exp Trials Part B

 

9. Tell at least 3 controlled variables for this experiment and tell why these are controlled.

a. Controlled Variables Part A

b. Controlled Variables Part B

 

10. Describe at least 2 potential uncontrolled variables.

a. Uncontrolled Variables Part A

b. Uncontrolled Variables Part B

 

11. Identify 2 potential sources of error in this experiment, tell what error category each fits into AND explain how each could occur.

a. Error Category & Example Part B

b. Error Category & Example Part B

 

12. CQC Both Part A and Part B Data Tables

Part A

Data Table One- Balloon

MASS Measurements

Lab #
Mass of Balloon @

Atmospheric pressure (g)

Mass -Balloon Filled (g)
Mass of Air

+Gain or - Loss (g)

1

2

3

4

5

6

7

8

Averages

Operator Observers

Recorder

Part B

Data Table Two- 2L Bottle

MASS Measurements

Lab #
Mass 2L bottle Atmospheric Pressure (g)
Mass 2L bottle

x 300 pumps(g)

Mass of Air

+Gain or - Loss (g)

1

2

3

4

5

6

7

8

Averages

Operator: Observers:

Recorder:

13. Create side by side CQC Bar Graphs - Mass Measurements using the High/Low/Avg amount of gain/loss of air in grams for both sets of experimental trials.

 

14. Calculate the range of the mass of air gained in the balloons and in the 2L bottles. Show all work.

 

15. Develop a Short Answer (brief Conclusion) for this experiment (Conclusive Statement, Supporting Data, and Explanation). Use your Short Answer guideline paper to help.

a. Start with a Conclusive statement.

b. Be sure to tell the High, Low and Average mass gained for both parts of the experiment in the Supporting Data section.

c. Compare range of mass gained/lost in both experiments in the Explanation section

16. Describe how the design of this experiment strengthened the reliability of the experiment.

 

17. Explain how the design of this experiment strengthened the validity of this experiment.

 

18. Tell what type of Relationship is demonstrated in this lab & explain WHY.

 

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