0.5 0.45 0.4 0.35 0.3 -0.25 0.2 0.15 0.5 0.45 0.4 0.35 a 0.3 0.25 0.2 0.15 6 0.1
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0.5 0.45 0.4 0.35 0.3 -0.25 0.2 0.15 0.5 0.45 0.4 0.35 a 0.3 0.25 0.2 0.15 6 0.1 0.05 0,05 Forest Field Forest Field Enclosure site Enclosure site Figure 15. The role of error bars in estimating differences in treatment groups The means in both graphs in Figure 15 are the same. Error bars indicate the standard deviation: If t-tests were run to determine whether the two groups (forest versus field) were significantly different than one another, which data set would be more likely to show a significant difference (the graph on the left or the one on the right)? In which data set would the difference between the means most likely be due to chance (the graph on the left or the one on the right)? · . Which figure conveys more information about the actual data set, Figure 6 or Figure 15? Explain why.Explanation / Answer
The graph on the left would likely show significant difference while the graph on the right appears to have the changes just by chance. This is because the error bars in the left one are short indicating that maximum values were close to the mean value. On the other hand, the right one has long error bars indicating that the absolute values vary remarkably from the average which when considered might not be very different from the other.
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