Transcript Statistics for Research in Ecology

Average Length of Sharpnosed Sharks
1000
Lengths of Sharks (cm)
990
980
970
960
950
940
930
920
Males
Females
Gender
Survival of the Sea Turtles
Number of Sea Turtles
25
20
15
10
5
0
Blue
Started Out
Orange
Red
Color
Survived
14
Length of Sea Cigars
number of sea cigars
12
10
8
# of sea cigars
6
4
2
0
Size Interval (cm)
Many things affect coral such as, temperature not
hot, or not to cold but warm, but between 70-85
degrees F and 21-29 degrees C. They need a
plethora of wave action, so the corals have
enough oxygen to survive. Corals need shallow
water to survive, because then the sun can give off
sunlight to them. Corals need clear water, so the
sunlight can go through the water and to the coral.
They also need clean water, because the coral is
sensitive to pollution and sediments. Probability is a
way to measure the chances that something will
occur in relation to the possible alternatives.
Variance- Two values that are
used in statistics to describe how
far away your data are from the
mean
Ideal picture of a distribution based upon random sampling
3
TDC of 25 Sea Cigars
2.5
Frequency
2
1.5
1
0.5
0
0
5
10
15
Length of Sea cigars (cm)
20
25
A t-test equation you will use to calculate the
t-statistic is one designed to test whether there is a
significant difference between the means of two
independent samples, those of your treatment and
control groups. This equation includes the mean,
the number, the variance, and the probability. The
probability must be less than 0.05.
p= .001545 Since p < .05, we reject the null
hypothesis, and accept the alternative hypothesis.
Therefore, there is a significant difference in Survival
rates between Beach Sites. A Chi-square Test can be
used to see if there are any significant differences
between data sites or sources. We found these
results by playing a sea turtle game. Everybody
started out with 25 sea turtles and would have to get
to the end with at least 1 turtle alive.
Beach
Sites
A
B
C
D
E
Actual
32
48
35
46
68
Expect 46
46
46
46
46
Painted Lady
Butterflies
Control Group
Total Days
Total Days
18
Treatment
Group
T1
C1
C2
DEAD
T2
19
C3
18
T3
19
C4
18
T4
DEAD
C5
18
T5
21
C6
18
T6
DEAD
C7
19
T7
DEAD
C8
18
T8
19
C9
19
T9
18
C10
20
T10
19
C11
18
T11
18
Mean: 18.1
Variance: 0.1
TTEST: P- VALUE= 0.065502
18
Mean: 18.875
Variance: 0.982143
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