# Christopher Contreras. Variance is a value is used in statistics to describe how far away your data is from the mean. The mean is the average.

## Presentation on theme: "Christopher Contreras. Variance is a value is used in statistics to describe how far away your data is from the mean. The mean is the average."— Presentation transcript:

Christopher Contreras

Variance is a value is used in statistics to describe how far away your data is from the mean. The mean is the average of the data. The formula for the variance is For example both sets of the following data have a mean of 10. Set 1 : 8,9,10,11,12 Set 2: 1,2,10,17,20. In the first set there is not much variation but in the second set the numbers vary a lot.

A Theoretical Distribution Curve is a theoretical or ideal picture of a distribution based upon random sampling.

The t-test is used to figure out if there is a significant difference between the averages of two independent samples of whatever they may be. The t-test result is when its greater than the number in the 1-2 table you reject your null hypothesis if it is less than the number you accept the null hypothesis. It incorporates the mean, the number and the variance.

The chi square test can be used to see if there are any significant differences between data sites or sources. We played the sea turtle game to see the differences in survival rates of turtles on the different nesting sites.

Sea turtles are an endangered species and for them to get to the sea and survive it is very rare. There are many reasons why they die; some of them can get eaten by predators before they even hatch, some humans catch them for different reasons, the get mislead by city light into the city, or get run over by dune buggies or other vehicles.

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