fix plot_ci and update documentation

OpenIntroStat / oilabs

🛑 This package has been deprecated and datasets and functionality have been moved to the openintro package

https://github.com/OpenIntroStat/openintro

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Closed AmeliaMN closed 9 years ago

AmeliaMN commented 9 years ago

removed the contains() function from plot_ci() and replaced with logical operators
updated documentation for function