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The droplevels() function drops unused levels from a factor or from factors in a data frame. Extract the observations in the data for which we

The droplevels() function drops unused levels from a factor or from factors in a data frame. Extract the observations in the data for which we know the mother's smoker status (either smoker or non-smoker) and drop the unused level from the Habit variable. Save this subset of the data as a separate data frame in the workspace. The subset of the data should contain all of the variables from the original data

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