Organizing data
Páginas: 8 (1848 palabras)
Publicado: 17 de septiembre de 2012
Esteban
Organizing Data
Period 4
110912
How is data displayed to make it meaningful?
Why?
Scientists rely on data to describe nature and uncover relationships. The raw data—measurements taken
in the lab—are most useful when they are organized in a way that makes the relationships clear. In this
activity you will explore two common ways that scientists organize data to help inanalysis.
Model 1 – Copper Samples
Group
Volume (cm3)
Number
1
2.0
2
6.0
3
10.0
4
8.0
5
14.0
6
4.0
7
12.0
Mass (g)
Substance
17.92
50.89
93.45
79.30
125.44
39.80
103.85
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Room Temperature: 21.7 °C
1. What substance were the students working with to obtain the data in Model 1?
Copper
2. What variablesdid the students measure to produce the data in Model 1?
Mass was the dependant variable and volume the independent variable
3. Briefly describe an experiment that the class might have done on the day that the data in Model
1 was collected. Discuss your answer with your group members to be sure there is consensus.
The effect of volume on copper's mass.
Every group was given different masssample and then recorded both the mass and the volume of the sample. These
data can be used to obtain the density of the material.
4. Consider the data in Model 1.
a. Which variable was the independent variable in the experiment, and why do you think it
was the independent variable?
Volume was the independent variable, it is the independent because it is the one that is not affected by
anyother variables.
b. Which variable was the dependent variable in the experiment, and why do you think it was
the dependent variable?
The dependant variable is mass, since it is the one that is affected by another variable: volume.
c. List two controlled variables in the experiment?
Room pressure and room temperature, amount of scientist.
Organizing Data
1
5. Consider the data inModel 1.
a. How is the data organized?
The data is organized in columns and by group numbers.
b. Is the table in Model 1 organized in a way that helps determine a relationship between the
independent and dependent variables in the experiment? Explain.
No, it it is hard to tell how is the volume of copper affecting its mass.
Because the independent variable isn't in order.
6. Propose abetter way to organize the data in Model 1, and transcribe the data into the table
below.
Group
Volume (cm3)
Number
1
2.0
2
4.0
3
6.0
Mass (g)
17.92
Substance
Copper
39.80
Copper
50.89
Copper
4
8.0
79.30
Copper
5
10.0
93.45
Copper
6
12.0
103.85
Copper
125.44
Copper
7
14.0
7. The data table in Question 6should allow you to state a relationship between the variables
involved in the class’s experiment. Complete the following statement:
Increases as well.
As the volume of copper increases, the mass of copper ________________________________.
Read This!
When scientists design an experiment they are usually looking for a cause-and-effect relationship between
the independent variable and thedependent variable. Therefore, organizing the data by the independent
variable is the easiest way to reveal a relationship. When the data is not organized, the relationships are not
apparent.
2
POGIL™ Activities for High School Chemistry
Model 2 – Graphs for Copper Data
Graph A
Graph B
Copper Samples
140
120
100
100
Mass (g)
120
Mass (g)
Copper Samples
14080
60
40
60
40
20
20
0
80
0
0
2
4
6
2
8
6
Group Number
10
8
14
4
12
Volum e (cm3)
Graph C
Copper Samples
140
120
Mass (g)
100
80
60
40
20
0
0
2
4
6
8
10
3
Volum e (cm )
12
14
16
8. Identify each of the graphs in Model 2 as a bar graph or a scatter plot.
Graph A: Scatter plot
Graph B: Bar...
Organizing Data
Period 4
110912
How is data displayed to make it meaningful?
Why?
Scientists rely on data to describe nature and uncover relationships. The raw data—measurements taken
in the lab—are most useful when they are organized in a way that makes the relationships clear. In this
activity you will explore two common ways that scientists organize data to help inanalysis.
Model 1 – Copper Samples
Group
Volume (cm3)
Number
1
2.0
2
6.0
3
10.0
4
8.0
5
14.0
6
4.0
7
12.0
Mass (g)
Substance
17.92
50.89
93.45
79.30
125.44
39.80
103.85
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Room Temperature: 21.7 °C
1. What substance were the students working with to obtain the data in Model 1?
Copper
2. What variablesdid the students measure to produce the data in Model 1?
Mass was the dependant variable and volume the independent variable
3. Briefly describe an experiment that the class might have done on the day that the data in Model
1 was collected. Discuss your answer with your group members to be sure there is consensus.
The effect of volume on copper's mass.
Every group was given different masssample and then recorded both the mass and the volume of the sample. These
data can be used to obtain the density of the material.
4. Consider the data in Model 1.
a. Which variable was the independent variable in the experiment, and why do you think it
was the independent variable?
Volume was the independent variable, it is the independent because it is the one that is not affected by
anyother variables.
b. Which variable was the dependent variable in the experiment, and why do you think it was
the dependent variable?
The dependant variable is mass, since it is the one that is affected by another variable: volume.
c. List two controlled variables in the experiment?
Room pressure and room temperature, amount of scientist.
Organizing Data
1
5. Consider the data inModel 1.
a. How is the data organized?
The data is organized in columns and by group numbers.
b. Is the table in Model 1 organized in a way that helps determine a relationship between the
independent and dependent variables in the experiment? Explain.
No, it it is hard to tell how is the volume of copper affecting its mass.
Because the independent variable isn't in order.
6. Propose abetter way to organize the data in Model 1, and transcribe the data into the table
below.
Group
Volume (cm3)
Number
1
2.0
2
4.0
3
6.0
Mass (g)
17.92
Substance
Copper
39.80
Copper
50.89
Copper
4
8.0
79.30
Copper
5
10.0
93.45
Copper
6
12.0
103.85
Copper
125.44
Copper
7
14.0
7. The data table in Question 6should allow you to state a relationship between the variables
involved in the class’s experiment. Complete the following statement:
Increases as well.
As the volume of copper increases, the mass of copper ________________________________.
Read This!
When scientists design an experiment they are usually looking for a cause-and-effect relationship between
the independent variable and thedependent variable. Therefore, organizing the data by the independent
variable is the easiest way to reveal a relationship. When the data is not organized, the relationships are not
apparent.
2
POGIL™ Activities for High School Chemistry
Model 2 – Graphs for Copper Data
Graph A
Graph B
Copper Samples
140
120
100
100
Mass (g)
120
Mass (g)
Copper Samples
14080
60
40
60
40
20
20
0
80
0
0
2
4
6
2
8
6
Group Number
10
8
14
4
12
Volum e (cm3)
Graph C
Copper Samples
140
120
Mass (g)
100
80
60
40
20
0
0
2
4
6
8
10
3
Volum e (cm )
12
14
16
8. Identify each of the graphs in Model 2 as a bar graph or a scatter plot.
Graph A: Scatter plot
Graph B: Bar...
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