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    1️⃣ Python 🐍 - CO2 Emissions

    Now let's now move on to the competition and challenge.

    📖 Background

    You volunteer for a public policy advocacy organization in Canada, and your colleague asked you to help her draft recommendations for guidelines on CO2 emissions rules.

    After researching emissions data for a wide range of Canadian vehicles, she would like you to investigate which vehicles produce lower emissions.

    💾 The data I

    You have access to seven years of CO2 emissions data for Canadian vehicles (source):

    • "Make" - The company that manufactures the vehicle.
    • "Model" - The vehicle's model.
    • "Vehicle Class" - Vehicle class by utility, capacity, and weight.
    • "Engine Size(L)" - The engine's displacement in liters.
    • "Cylinders" - The number of cylinders.
    • "Transmission" - The transmission type: A = Automatic, AM = Automatic Manual, AS = Automatic with select shift, AV = Continuously variable, M = Manual, 3 - 10 = the number of gears.
    • "Fuel Type" - The fuel type: X = Regular gasoline, Z = Premium gasoline, D = Diesel, E = Ethanol (E85), N = natural gas.
    • "Fuel Consumption Comb (L/100 km)" - Combined city/highway (55%/45%) fuel consumption in liters per 100 km (L/100 km).
    • "CO2 Emissions(g/km)" - The tailpipe carbon dioxide emissions in grams per kilometer for combined city and highway driving.

    The data comes from the Government of Canada's open data website.

    # Import the pandas and numpy packages
    import pandas as pd
    import numpy as np
    
    # Load the data
    cars = pd.read_csv('data/co2_emissions_canada.csv')
    
    # create numpy arrays
    cars_makes = cars['Make'].to_numpy()
    cars_models = cars['Model'].to_numpy()
    cars_classes = cars['Vehicle Class'].to_numpy()
    cars_engine_sizes = cars['Engine Size(L)'].to_numpy()
    cars_cylinders = cars['Cylinders'].to_numpy()
    cars_transmissions = cars['Transmission'].to_numpy()
    cars_fuel_types = cars['Fuel Type'].to_numpy()
    cars_fuel_consumption = cars['Fuel Consumption Comb (L/100 km)'].to_numpy()
    cars_co2_emissions = cars['CO2 Emissions(g/km)'].to_numpy()
    
    # Preview the dataframe
    cars
    # Look at the first ten items in the CO2 emissions array
    cars_co2_emissions[:10]

    💪 Challenge I

    Help your colleague gain insights on the type of vehicles that have lower CO2 emissions. Include:

    1. What is the median engine size in liters?
    2. What is the average fuel consumption for regular gasoline (Fuel Type = X), premium gasoline (Z), ethanol (E), and diesel (D)?
    3. What is the correlation between fuel consumption and CO2 emissions?
    4. Which vehicle class has lower average CO2 emissions, 'SUV - SMALL' or 'MID-SIZE'?
    5. What are the average CO2 emissions for all vehicles? For vehicles with an engine size of 2.0 liters or smaller?
    6. Any other insights you found during your analysis?
    #1
    cars['Engine Size(L)'].mean()

    The median engine size in liters is 3.16

    #2
    zcars =cars.loc[cars['Fuel Type']=='Z']
    zcars['Engine Size(L)'].mean()
    ecars =cars.loc[cars['Fuel Type']=='E']
    ecars['Engine Size(L)'].mean()
    
    dcars =cars.loc[cars['Fuel Type']=='D']
    dcars['Engine Size(L)'].mean()
    #3
    import numpy as np
    cars['CO2 Emissions(g/km)'].corr(cars['Fuel Consumption Comb (L/100 km)'])

    The correlation between fuel consumption and CO2 emissions is 0.918. That means that there is a high correlation between them, so a higher fuel consumption will mean high CO2 emissions

    #4
    suvcars=cars.loc[cars['Vehicle Class']=='SUV - SMALL']
    suvcars['CO2 Emissions(g/km)'].mean()
    midcars=cars.loc[cars['Vehicle Class']=='MID-SIZE']
    midcars['CO2 Emissions(g/km)'].mean()