Sabrina Alexis

1
Statistics for Research in Ecology

• Sabrina Alexis

2
Shark Statistics
3
Sea Turtles
4
Marine Debris
5
Sea Cigars
6
Coral Probability

• Probability is a way to measure the chances that
  something will occur in relation to the possible
  alternatives.
  There are many
  reasons why corals are dying. For example
• Coral bleaching, which is caused by elevated sea
  surface temperatures due to global climate change
• Rising levels of CO2
• Over fishing (bomb and cyanide fishing)
• 
  

7
How problems affect the reef

• Coral reefs need the water to be between 74-84
  degrees Fahrenheit. If the temperature is even 1
  degree more or 1 degree less the coral reefs will
  die. The temperatures are going up because of
  global warming. Coral bleaching is when the water
  is too warm, corals will force out the algae
  (zooxanthellae) living in their tissues causing
  the coral to turn completely white. This is
  called coral bleaching.

8
Variance

• Variance is used in statistics to describe how
  far away your data is from the mean.
• This is the formula for variance

9
Theoretical Distribution Curve

• A Theoretical Distribution Curve (TDC) is a
  theoretical or ideal picture of a distribution
  based upon random sampling.
• Example

10
T-test
This is the formula pool variance

• A T-test is an equation used to determine whether
  theres a significant difference between two
  group means. The t-statistic is designed to test
  if the is a major difference between the means of
  the independent samples.

This is a T-test
11
Chi Square

• A chi square test is used to see if there are any
  significant differences between data sites and
  sources.

Today in statistics we played a turtle game to se
if there was a difference in the survival rates
of turtles at different beach sites.
12
Sea Turtle Survival

• Sea turtles have many predators such as
• Raccoons
• Crabs
• Humans
• And birds

Sea turtles are also injured by marine debris. If
they eat plastic bags (which somewhat look like
a jellyfish) then it will stay in there stomachs
and they are not able to digest it. Soon they
will die because it is stored in their stomachs
for a long time.
13
Caterpillar Data
This data shows that there is no difference
between the treatment and control group.
C1 6/21 7/14/12 23 T1 6/21 7/11/12 20
C2 6/21 7/14/12 23 T2 6/21 7/14/12 23
C3 6/21 7/14/12 20 T3 6/21 7/14/12 23
C4 6/21 7/14/12 23 T4 6/21 DIED
C5 6/21 7/11/12 20 T5 6/21 7/14/12 23
C6 6/21 7/11/12 20 T6 6/21 7/14/12 23
C7 6/21 7/10/12 19 T7 6/21 7/14/12 23
C8 6/21 7/14/12 23 T8 6/21 7/14/12 23
C9 6/21 7/14/12 23 T9 6/21 7/12/12 21
C10 6/21 7/14/12 23 T10 6/21 7/14/12 23
C11 6/21 7/14/12 23 T11 6/21 7/14/12 23
C12 6/21 7/12/12 21 T12 6/21 7/14/12 23
C13 6/21 7/12/12 21 T13 6/21 7/11/12 20
C14 6/21 7/14/12 23 T14 6/21 7/14/12 23
C15 6/21 7/14/12 23 T15 6/21 7/14/12 23