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Error bars show the variability or spread of data through either the range or standard deviation. The standard deviation measures how far data points deviate from the mean on average, with 68% of a normally distributed data set falling within one standard deviation. The t-test determines if there is a significant difference between the means of two populations by calculating the probability they are the same and comparing it to the typical critical probability of 5%.

Author

mwgwalker

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EN