1. What is the importance do standard deviation with regards to the mean ?
The standard deviation is the average amount by which the data points differ from the mean. Basically how far from the mean the data points are.
2. What do error bars indicate?
error bars are a graphical representation of the variability of data
3. What percentage of values fall within 1 standard deviation of the mean? And 2?
68% of the values fall within one standard deviation of the mean
95% of the values fall within two standard deviation of the mean
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