Statistics Class

Male

Female

920 930 940 950 960 970 980 990 1000

Mean Length Atlantic Sharp-Nose Shark

LENGHT IN MM

Gender of sharks

Males Females920 850928 932935 960943 960950 965950 972954 980960 980962 985974 995975 1000975 1000

10091010101010101020102510251028103010381043105410601160

The sharp –nosed shark consumes shrimp, mollusks and small fishes.

blue yellow green red orange

0

5

10

15

20

25

Survived

# hatchlings

Sea Turtle DataBeach Site F

Color Survived # hatchlingsblue 13 25yellow 25 25green 18 25red 3 25orange 4 25

Sea Turtles Sea turtles often drown when caught in fishing gear: both nets and loglines. Coastal development can destroy important nesting sites, impact coral reefs, and artificial light from houses and other buildings distracts hatchlings away from the ocean. 

21%

4%

9%

14%14%6%

18%

13%1%

Percentage of bottle caps found on the beach

red orange yellow blue green purple black white clear other

Color of bottle cap

# of caps

Percentage

red 18 21orange 3 4yellow 8 9blue 12 14green 12 14purpleblack 5 60white 15 18clear 11 14other 1 1

The “garbage patches” are areas of marine debris concentration (due to oceanographic features)in the North Pacific Ocean. The term “garbage patches”is a misnomer. There is no island of trash forming in the middle of the ocean nor a blanket of trash that can be seen with satellite or aerial photographs.

"1-5" "6-10" "11-15" "16-20 "21-25" "26-30" "31-35"0

2

4

6

8

10

12

14

Frequency Distribution of Sea Cigars by Size(cm)

Size Class (cm)

Fre

quency

Size Class Frequency"1-5" 0"6-10" 1"11-15" 4"16-20 13"21-25" 4"26-30" 2"31-35" 1

theoreticalobserved

0

0.2

0.4

0.6

Probability of Observed and Theoretical Survival

Survivalp

rob

ab

ilit

y

Water temp. Depth

Wave action survived

1 3 1 4yes2 1 1 1no3 4 2 4yes4 2 3 2no5 4 1 4yes6 3 2 4yes7 6 5 5no8 1 5 5no9 6 3 3no

10 3 2 5yes11 2 1 6yes12 2 3 5yes13 1 4 6no14 6 4 5no15 6 6 1no16 3 3 2no17 3 2 5yes18 3 3 6yes

theoretical observed0.22 0.5

Coral reefs are found all around the world in tropical and subtropical oceans. They are usually found in shallow areas at a depth of less than 150 feet. However, some coral reefs extend even deeper, up to about 450 feet deep.

Variance

𝜎 2=∑¿ ¿

The squared version of the standard deviation

Standard deviation

 Shows how much variation or dispersion exists from the average

𝜎=√𝑉𝑎𝑟𝑖𝑎𝑛𝑐𝑒

1 2 3 4 5 6 7 8 9 10111213141516171819202122230

1

2

3

4

5

Actual distribution of sea cigars

Size(cm)

Fre

quency

4 6 8 10 12 14 16 18 20 22 240

2

4

6

8

10

12

TDC

Size(cm)

Fre

quency

*TDC: Theoretical picture of distribution based upon random sampling. Serves as a standard with the actual distributions can be compared.

T-Test

𝑇=¿ ¿

A t-test is any statistical hypothesis test in which the test statistic follows a Student's t distribution if the null hypothesis is supported.