Transcript FCAT Data Analysis Continued 11/6/09

FCAT Data Analysis Continued
11/6/09
Assignment #37 Continued
(#33 Continued for 4th Period)
Graphing Practice Problem #1
The thickness of a tree’s
annual rings indicate what
environmental conditions were
like at the time of its
development (tree’s age). A
thin ring indicates lack of
water, forest fires, or a major
insect infestation, etc. On the
other hand, a thick ring
indicates just the opposite.
1. What is the dependent
variable?
Ring thickness
2. What is the independent
variable?
Age of the tree
3. Create a graph of the data.
Age of
the
tree in
years
Average
thickness of the
annual rings in
cm.
Forest A
Average
thickness of the
annual rings in
cm.
Forest B
10
2.0
2.2
20
2.2
2.5
30
3.5
3.6
35
3.0
3.8
50
4.5
4.0
60
4.3
4.5
Annual ring thickness as indicator of environmental situation
Thickness of Rings (cm)
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
A
B
10
20
30
35
50
60
Tree Age (Years)
Which Forest had the least amount of growth in a measured time period? How old
were the trees during this time?
Forest A; between 30 & 35 years old.
Thickness (cm)
Annual Ring Thickness
Forest A
Thickness (cm)
Forest B
Thickness (cm)
10
20
30
35
Age (years)
50
60
Graphing Practice
Problem #2
Number of
hookworms in the
intestine
Amount of blood
lost per day in cm3
24
12
45
22.5
80
40
88
44
63
31.5
50
25
12
6
Hookworms live in the human intestine drinking
the blood it sucks from the intestine wall. It
is estimated that a single hookworm can
drink 1/2 cm3 of blood per day. The chart
above contains data on the number of
hookworms and the amount of blood lost
caused by that number of worms.
1.
In some cases the data table is blank. Copy
the table. Determine the number of worms
or the amount of blood lost and complete
the table.
2.
What is the dependent variable?
amount of blood lost daily
3.
What is the independent variable?
number of hookworms
4.
Make a line graph of the data.
44 cm3
Graphing Practice Problem #3
The volume of a gas decreases as the temperature of the gas decreases. A sample
of gas was collected at 100 degrees Celsius and then cooled. The changes in the
volume of the sample are shown below.
1. Graph the data.
2. Extend the graph beyond the measured
data so that the volume of the gas
reaches 0 ml. The temperature at
which the volume of the gas reaches
zero is Absolute Zero.
3. From this graph, what is the Celsius
Temperature for Absolute Zero?
T ( oC )
100
80
60
40
30
20
10
0
-10
-30
V ( ml )
317
297
288
278
252
243
236
233
227
202
V (ml)
Temp. (oC)
90
-2
50
-2
10
-2
70
-1
30
-1
0
-9
0
-5
0
-1
20
60
350
300
250
200
150
100
50
0
10
0
V (ml)
Temp. vs Vol. of a Gas
273.15 oC