Identifying Variables Practice Name: ______

*Using the given information identify the Independent and Dependent Variables:

Definitions: Independent Variable = ______
Dependent Variable =______

1.  A man tested different types of gum to see which gum’s flavor lasted the longest.

  1. I.V. =
  2. D.V. =

2.  A woman wanted to see what temperature would be the best to grow roses in.

  1. I.V. =
  2. D.V. =

3.  Scientists studied lions to see what type of prey they fed upon. They observed the same group of lions for 2 months and then listed the numbers and types of different animals that they ate.

  1. I.V. =
  2. D.V. =

4.  Scientists experimented on different types of ants to see which is the strongest.

  1. I.V. =
  2. D.V. =

5.  Data was gathered on Lake Park students; 50 boys and 50 girls were asked how long each day they studied. The average time per day was 1 hour.

  1. I.V. =
  2. D.V. =

6.  5 types of dogs were tested to see which was the most kid friendly.

  1. I.V. =
  2. D.V. =

7.  The amount of plant growth was tested based on different amounts of fertilizer given.

  1. I.V. =
  2. D.V. =

8.  85 bubbles were given off by bubble machine A and 100 bubbles were given off by bubble machine B.

  1. I.V. =
  2. D.V. =

9.  Three different colored markers were used on the same overhead by a teacher to see which would stand out the most for the students during her lecture.

  1. I.V. =
  2. D.V. =

10.  The amount of comfort really depends on the type of couch you sit in.

  1. I.V. =
  2. D.V. =

11. 

·  Use the graph above to figure out the variables.

  1. I.V. =
  2. D.V. =

12. 

·  Use the graph above to figure out the variables.

  1. I.V. =
  2. D.V. =

Control Groups, Factors that are kept the Same and Conclusions:
Name: ______

Experiment 1: Bob took skin cells and grew them in 3 different containers to see which environment allowed the cells to grow and reproduce the best. The skin cells all came from a mouse and they were all taken from the leg of the mouse. Bob let all of the cells grow and reproduce for 5 days, and the cells were all given the same nutrients.

1.  What factors in this experiment were kept the same?

  1. List 3 factors: ______

Experiment 2: Sue had 5 of the same type of plant (pea plants) and let each pea plants grow in the same environment for a month. She wanted to see how the amount of water each received affected the overall height of the plants. Her results are presented in the table below:

Plant and Amount of Water Given / Height after One Month (cm)
Plant 1 was given NO water at all / 2 cm
Plant 2 was given ½ cup a day / 5 cm
Plant 3 was given 1 cup a day / 7 cm
Plant 4 was given 1 ½ cups a day / 8 cm
Plant 5 was given 2 cups a day / 5 cm

1.  What factors in this experiment were kept the same? ______

2.  What would be the Control Group in this experiment? ______

3.  What Conclusion could you make about how water affects Pea Plant growth? (Support with Data!)
______.

4.  What type of data is 8 cm? (Quantitative or Qualitative) ______

Experiment 3: Sampson gathered the following data on house “Insulators.” He tested 4 different houses all of which were in the same area and exposed to the same outdoor temperature (-10 degrees F). Here are his results:

Type of Insulator for your home / Temperature of inside when surrounded by -10 degrees F
No insulation at all / 10 degrees F
Fiberglass Rolls of Insulation / 50 degrees F
Foam Board Insulation / 55 degrees F
Spray in Foam Insulation / 65 degrees F

5.  What factors in this experiment were kept the same? ______

6.  What would be the Control Group in this experiment? ______

7.  What Conclusion could you make about the effectiveness of the different Insulators? (Support with Data!)
______.

8.  What type of data is Foam board vs. Spray in Foam? (Quantitative or Qualitative) ______

Rule of THUMB: “Data Table” Practice Name:______

Create a data table according to the THUMB method using the following data: “A ruler may be helpful”

There were 12 Northern Pike, 22 Large Mouth Bass, 18 Small Mouth Bass, 52 Black Crappie, 78 Bluegill, and 7 Catfish found in the local Pond.

Create a data table according to the THUMB method using the following data:

Olympic sprinters from different countries ran 3 consecutive 100 meter dashes. Each country was asked to average their results to find out how they ranked (Best to Worst). Here are their results: U.S. times = 12.5 seconds, 12.8 seconds & 12.2 seconds. Germany times = 13 seconds, 12.5 seconds & 13.2 seconds. China times = 13.1 seconds, 12.8 seconds & 13.5 seconds. Africa times = 12.1 seconds, 12.0 seconds & 11.8 seconds. Include averages in your table!

Graphing Practice Using the TASTE method: Name: ______

Graph 1: Graph the following data with the correct type of graph using the TASTE method:

Students / Test Average in Science Class
Bobby / 80%
Suzy / 72%
Tyrone / 91%
Jenny / 88%
Ike / 68%

Graph 2: Graph the following data with the correct type of graph using the TASTE method:

# of Days / Plant Height Each Month Measured in (cm)
5 days / 5 cm
10 days / 7 cm
15 days / 9 cm
20 days / 10 cm
25 days / 11 cm
30 days / 15 cm
35 days / 20 cm
40 days / 27 cm