def get_normalized_data(data, column_name):
    """
    Minimax normalize the data in a DataFrame column.

    Args:
        data (Pandas.DataFrame): The DataFrame with the column to normalize
        column_name (string): The name of the column to normalize

    Returns:
        Pandas.DataFrame: The DataFrame with a column added for the normalize
            column data.
    """

    min = data[column_name].min()
    max = data[column_name].max()
    data['%s_norm' % column_name] = ((data[column_name] - min) / (max - min))

    return data