Word 2016 In Depth (includes Content Update Program) by Faithe Wempen

Author:Faithe Wempen [Wempen, Faithe]
Language: eng
Format: azw3
Publisher: Pearson Education
Published: 2015-11-03T05:00:00+00:00

Adding Error Bars

When sampling a population for research purposes, how can you be certain that you didn’t get unusual data? For example, what about the basketball player who is naturally so good at free throws that he can shoot 90% without practice? With a small sample, you can’t be sure that your data isn’t being skewed by unusual cases, but as the sample size grows, so does your confidence in your results.

Even though the formula from the trendline in the preceding section can provide a prediction of a value, in reality that value may be off. The actual value might turn out to be higher or lower than that. For example, what if someone practices free throws for 1.5 hours? The chart in Figure 12.27 indicates that the expected score would be somewhere around 77, but that’s just a guess. The amount by which a guess could be off—in either direction—is its margin of error. That margin of error is shown on a chart by using error bars.

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