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# Topic 1: Statistical Analysis

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I.B. students testing out of SL Biology need to know a few things from topic 1 about statistical analysis

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### Topic 1: Statistical Analysis

1. 1. Topic 1Statistical Analysis
2. 2. Normal DistributionMean in center
3. 3. Standard Deviation• Used to assess how far the values arespread above and below the mean• 68% of values lie within one standarddeviation• 95% of values lie within two standarddeviations• Can be used to determine whether thedifference between two means issignificant
4. 4. Error Bars• Bars on graphs extending above andbelow the mean value• Show the variability of data• Can be used to show the range of data orthe standard deviation
5. 5. The t-Test• Can be used to find out whether there is asignificant difference between the means oftwo populations• If the probability of it being due to randomvariation is 5% or less it is consideredstatistically significant• The larger the difference between twomeans, the larger t is• The larger the standard deviations, thesmaller t is
6. 6. Correlation and Cause• The existence of a correlation betweentwo variables does not indicate and causalrelationship between the two