Exercise

Bar plots with error

In the video, we saw how to incorporate error bars into our bar plot to give the viewer a sense of the uncertainty in our estimates. We used error bars of +/- 1 standard error, but it's also common to use +/- 2 standard errors since that roughly represents a confidence interval for the quantity of interest.

Instructions 1/2

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Add two columns to out: lower where the values are two standard errors below the means given in SleepHrsNight and upper where the values are two standard errors above the means given in SleepHrsNight.