1. Variance Standard Deviation

2. Atlantic Sharp-nose Sharks Mean-The average of your set. Median-The halfway point of the data set when the numbers are arranged in ascending order. Mode- The most repeated number in a data set. Range-

3. Sea Turtles #Observed Percent % Total # in sample This is the “Percent Triangle” →

4. Beach Trash- Bottle Caps A percent is a comparative calculation used to describe a number out of a sample of 100. The name per-cent means “for every 100.”

5. Measuring Sea Cigars We measured twenty- five sea cigars. Most of them were from around 15 cm to about 25 cm Most of them were large, but some of them were small.

6. Probability and Chance of Coral Planula survival Trial #Survived? 1No 2 3 4 5Yes 6 7 8No 9 10Yes 11No 12Yes 13No 14Yes 15No 16No 17Yes 18Yes Probability is a way to measure the chances that something will occur in relation to the possible alternatives. A simple event is when something happens once. A compound event is more than one simple events. 3 things that affect Coral Planula is water temperature, depth, and wave action.

7. standard deviation 9 10 12 13 15 16 18 19 20 21 22 23 24 25 26 27 4.813176359 Standard Deviation Standard deviation is basically the square root of the variance of a data set KEY ∑= the sum X= the mean of the data X= each data value n= the number values s=

8. variance 9 10 12 13 15 16 18 19 20 21 22 23 24 25 26 27 23.16666667 Variance Two values that are used in statistics to describe how far away your data are from the mean are variance and standard deviation. The variance is calculated as: ∑(X-X)² n-1 KEY ∑= the sum X= the mean of the data X= each data value n= the number values s²=

9. Theoretical Distribution Curve Using Mean and Standard Deviation.

10. ControlTreatment 14 13 15 1315 1315 1314 15 P=0.000545 T-Test X 1 -X 2 P-value must be less than 0.05 in order to reject the null hypothesis. If the p- value is greater than 0.05 than we will fail to reject the null hypothesis.