Computers and StatisticsJack Lawhorn

RiE Summer 2009

SharpnoseShark

Gender

Ave

rag

e L

eng

th

Male Female

Chi² Test

The Chi Square test is used to see if there are any significant differences between groups of data samples.

Distribution of Mass in Flotsam

Key

Coral Probability

4 out of my __ coral polyps survived.

Probability= the chance of an event occuring.

Standard Deviation &Variance

Variance= how close together a group of data is from the mean.

Standard Deviation= the square root of the variance.

Turtle Survival Percentage

Butterfly Pupation ProjectButterfly SurvivalControl Sample # Control Sample State Treatment sample # Treatment Sample State1 S 1 S2 S 2 D3 S 3 D4 S 4 S5 D 5 D6 S 6 D7 D 7 S8 S 8 S9 D 9 S10 S 10 S11 S 11 D12 S 12 D13 S 13 D14 D 14 S15 S 15 D16 S 16 D

Chi-square TableObserved Predicted12 9.54 6.57 9.59 6.5

Above: S= Survived///D= DiedBellow: Overall Survival Rate 59.4% There was no significant difference but it was so close that it would be worth it to do the same experiment with hundreds or even thousands of samples.

Chi-square Value: 3.24 compared w/ 3.84 from Chi-square table at 1 DF.

I Hope You Enjoyed It

This Is the End of the Presentation