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Statistics

Statistics. By Varsha Udayakumar Research in Ecology. Sharp-nosed Sharks. Turtles. Bottle Caps. Sea Cigars (seed propagules ). Coral Planula. Predicted Probability. Probability: a way to measure the chances that something will occur in relation to the possible alternatives.

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Statistics

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  1. Statistics By VarshaUdayakumar Research in Ecology

  2. Sharp-nosed Sharks

  3. Turtles

  4. Bottle Caps

  5. Sea Cigars(seed propagules)

  6. Coral Planula • Predicted Probability Probability:a way to measure the chances that something will occur in relation to the possible alternatives To survive a coral planula needs: Warm temperatures (but not too warm) Shallow water and Rough waves

  7. Variance of Sea Cigars Variance:how much variation exists around the mean. The variance for this data set is24.44333. The Variance formula is: 2= ∑ (X-X)2 n-1 Key: σ2 : the variance n : the number of values ∑: the sum of X : the mean X : each data value

  8. Standard Deviation of Sea Cigars Standard Deviation:describes how spread out the data are; is symbolized σ. The standard deviation for this data set is ±4.94402. To find the standard deviation: √variance Key: √ : the square root of ± : plus or minus

  9. Distribution of Sea Cigars Theoretical Distribution Curve:a theoretical or ideal picture of a distribution based upon random sampling

  10. T-Test of Painted Lady Butterflies T-test:meant to test whether there is a significant difference between the means of two independent samples (the difference is also known as the t-statistic). Note:The p-value must be less than 0.05 in order to reject the null hypothesis. To find the t-statistic: t = (X1 – X2) √sp2 ( + ) Key: X1 : mean of first group sp2: the pooled variance X2 : mean of second group t : the t-statistic n1 : number of ? used in the first group n2 : number of ? used in the second group

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