1. What is the importance of standard deviation with regards to the mean?
Two sets of data can have the same mean but be totally different. The standard deviation shows the range of the data and helps more accurately compare two sets of data with the same mean.
2. What do error bars indicate?
Error bars are a graphical representation of the variability of data that show the degree of uncertainty relative to each data marker in a series. They show the spread of measurements around a central tendency on a graph. Error bars usually show the range of data, standard deviation or the 95% confidence intervals.
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% fall within two standard deviations.
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