Statistics for Research in Ecology

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Presentation transcript:

Statistics for Research in Ecology Natasha Viener Statistics for Research in Ecology

Sharks

Turtles

Bottle Caps

Sea Cigars

Corals Probability - The chance that something will occur in relation to the possible alternatives Many things can affect the coral and harm them Water temperature must be warm between 70 - 80° F or 21 - 29 ° C Sunlight so the algae can function Clear water to let sunlight through Clean water because they are sensitive to pollution Saltwater because they need a certain salt to water ratio

Variance Variance - Two values that are used in statistics to describe how far away your data are from the mean

TDC ( theoretical distribution curve) of Sea Cigars Theoretical Distribution Curve – The ideal picture of a distribution based upon random sampling

TTest TTest – an equation used to calculate the t-statistic designed to test whether there is a significant difference between the means of two independent samples. This equation includes the mean, the number, the variance and the probability.

Chi-Square A Chi-square test is used to see if there are any significant difference between data sites or sources. Since p < .05 we reject the null hypothesis and therefore there is a significant difference in the survival rates between beach sites.

Butterflies Control Group Total Treatment Group C1 16 T1 20 C2 T2 C3 21 C5 T5 C6 Dead T6 C7 T7 C8 T8 C9 T9 C10 T10 C11 T11 N/A C12 T12 C13 T13 C14 T14 C15 T15