For today's lab we will be using the Car Object Class which we built in Lab 1. I have attached my solution if you would prefer to use my solution instead of your own solution.

We will working on remembering how to build sub-classes and user interfaces. So we will be creating new Java files for:

• An Interface called GreenHouseGasser
  • Requires a method called CO2() which returns how much carbon dioxide the Object produces.
  • Make sure to update Car so that Car implements GreenHouseGasser. Cars should produce 1.5 units of CO2 for every mph the car is traveling.
• A Car sub-class called SportsCar:
  • Overrides the accelerate() method. SportsCars accelerate twice as fast as regular Cars
  • Overrides the CO2() method. SportsCars should be using a factor of 3.25 units of CO2 for every mph
• A Car sub-class called EcoCar
  • Overrides the accelerate() method. EcoCars accelerate 25% as fast as regular Cars
  • Overrides the CO2() method. EcoCars should be using a factor of .33 units of CO2 for every mph

As your are building/updating your objects, remember to test. You'll need update the Driver to test your new methods and Objects!

Submit all of your .java files in one jar or zip file.

Grading Breakdown:

• Driver tests all new methods and objects -- 25%
• Interface created correctly and Car updated to implement the Interface -- 25%
• SportsCar correctly created -- 20%
• EcoCar correctly created -- 20%
• JavaDoc comments! -- 10%

Here is the Car Object pre-made:

public class Car
{
private String name;
private int currentSpeed;
  
public Car(String inName)
{
name = inName;
}
  
public void accelerate()
{
currentSpeed += 10;
}
  
public void park()
{
currentSpeed = 0;
}
  
public void printCurrentSpeed()
{
System.out.println("Current Speed is: " + currentSpeed);
}
}

Here is the driver that is supposed to be used:

public class Driver {
  
   public static void main(String[] args) {
       // create new Audi car
       Car audi = new Car("Audi");
       // create new Nissan car
       Car nissan = new Car("Nissan");
      
       // print current speed of Audi - it is 0
       audi.printCurrentSpeed();
      
       // call the accelerate method twice on Audi
       audi.accelerate();
       audi.accelerate();
      
       // call the accelerate method once on Nissan
       nissan.accelerate();
      
       // print current speed of Audi - it is now 20 mpH
       audi.printCurrentSpeed();
       // print current speed of Nissan - it is 10 mpH
       nissan.printCurrentSpeed();
      
       // now park the Audi car
       audi.park();
      
       // print current speed of Audi - it is now 0, because the car is parked
       audi.printCurrentSpeed();
   }
}

You are riding your bicycle directly away from a stationary source of sound and hear a frequency that is 0.7% lower than the emitted frequency. The speed of sound is 346 m/s. What is your speed?

Using the Motor Trend Cars Data Set, you would like to determine if there is a relationship between MPG (miles per gallon) and specific variables included in the data set.

1. Develop a correlation matrix using MPG (miles per gallon), HP (horsepower), WT (weight). Is the correlation between the variables MPG v HP significant? Perform the appropriate test and use a level of significance of 0.05
2. Fit a multiple regression model using MPG (miles per gallon) as the dependent variable and HP (horsepower), and WT (weight) as the independent variables. State your regression model.
3. Is the overall regression model significant? Conduct the appropriate hypothesis test for the significance of the overall regression model. Use a 0.05 level of significance.
4. Are the individual independent variables significant? Conduct the hypothesis tests for the significance of each independent variable at the= 0.05 level of significance.
5. What proportion of the variation in MPG is explained by the independent variables HP and WT?
6. Graph the residuals from the regression you developed in part (a). Do the regression assumptions appear to be appropriate given the residual plots? Explain your answer.

I am using IntelliJ IDEA with JavaFX to build a travel expensive calculator, but somehow it 

wouldn't calculate total expensive? It was working until I add the TextFieldListener because I need to make sure user

only input either mile driven or airfareCost. Please help me figure out what I did wrong.

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class Main extends Application {

    TextField field1, field2, field3, field4, field5, field6;
    Button submitButton, cancelButton;

    @Override
    public void start(Stage primaryStage) throws Exception{

        Label label1 = new Label ("(1) Number of days on the trip");
        Label label2 = new Label ("(2) Transportation cost (choose one only)");
        Label label3 = new Label ("Airfare Cost ");
        Label label4 = new Label ("Miles driven  ");
        Label label5 = new Label ("(3) Conference registration cost ");
        Label label6 = new Label ("(4) Lodging Cost (per night) ");
        Label label7 = new Label ("(5) Food cost (total) ");
        Label TotalExpensive = new Label("Total expenses: ");
        Label TotalExpensiveResult = new Label(" ");
        Label TotalCost = new Label("How much you own: ");
        Label TotalCostResult = new Label(" ");

        field1 = new TextField();
        field2 = new TextField();
        field3 = new TextField();
        field4 = new TextField();
        field5 = new TextField();
        field6 = new TextField();//all textfield

        submitButton = new Button ("Submit"); //Create submit button
        submitButton.setDisable( true);
        cancelButton = new Button ("Cancel"); //Create Cancel button


        HBox hBox = new HBox(20, label1, field1);
        HBox hBox1 = new HBox(10, label2);
        HBox hBox2 = new HBox(15, label3, field2);
        HBox hBox3 = new HBox(10, label4, field3);
        HBox hBox4 = new HBox(12, label5, field4);
        HBox hBox5 = new HBox(32, label6, field5);
        HBox hBox6 = new HBox(75, label7, field6);
        HBox hBox7 = new HBox(20, submitButton, cancelButton);
        HBox hBox8 = new HBox(20, TotalExpensive, TotalExpensiveResult);
        HBox hBox9 = new HBox(20, TotalCost, TotalCostResult);


        hBox.setAlignment(Pos.BASELINE_RIGHT); //Alignment
        hBox1.setAlignment(Pos.BASELINE_LEFT);
        hBox2.setAlignment(Pos.BASELINE_RIGHT);
        hBox3.setAlignment(Pos.BASELINE_RIGHT);
        hBox4.setAlignment(Pos.BASELINE_RIGHT);
        hBox5.setAlignment(Pos.BASELINE_RIGHT);
        hBox6.setAlignment(Pos.BASELINE_RIGHT);
        hBox7.setAlignment(Pos.CENTER);
        hBox8.setAlignment(Pos.BASELINE_LEFT);
        hBox9.setAlignment(Pos.BASELINE_LEFT);



        hBox1.setPadding(new Insets(0,0,15,0));
        hBox3.setPadding(new Insets(0,0,15,0));
        hBox7.setPadding(new Insets(15,0,0,0));
        hBox8.setPadding(new Insets(0,0,15,0));
        hBox9.setPadding(new Insets(0,0,15,0));

        TextFieldListener listener = new TextFieldListener();
        field1.textProperty().addListener(listener);
        field2.textProperty().addListener(listener);
        field3.textProperty().addListener(listener);
        field4.textProperty().addListener(listener);
        field5.textProperty().addListener(listener);
        field6.textProperty().addListener(listener);



        GridPane gridPane = new GridPane ();

        gridPane.add(hBox, 0, 0);
        gridPane.add(hBox1, 0, 1);
        gridPane.add(hBox2, 0, 2);
        gridPane.add(hBox3, 0, 3);
        gridPane.add(hBox4, 0, 4);
        gridPane.add(hBox5, 0, 5);
        gridPane.add(hBox6, 0, 6);
        gridPane.add(hBox7, 0, 7);
        gridPane.add(hBox8, 0, 8);
        gridPane.add(hBox9, 0, 9);
        gridPane.setAlignment(Pos.CENTER);
        gridPane.setPadding( new Insets(20, 20, 20, 20));
        gridPane.setVgap( 10);
        gridPane.setHgap( 10);
        primaryStage.setTitle("Travel Expenses Calculator");
        primaryStage.setScene(new Scene (gridPane));
        primaryStage.show();

        submitButton.setOnAction(event ->
        {

            double days = Double.parseDouble(field1.getText());
            double airFare = Double.parseDouble(field2.getText());
            double miles = Double.parseDouble(field3.getText());
            double ConregCost = Double.parseDouble(field4.getText());
            double lodgingCost = Double.parseDouble(field5.getText());
            double foodCost = Double.parseDouble(field6.getText());

            TotalExpensiveResult.setText(" " + ( airFare+ foodCost + ConregCost + (days * lodgingCost)) );

        });





    }

    private class TextFieldListener implements ChangeListener<String>
    {
        @Override
        public void changed(ObservableValue<? extends String> source, String oldValue, String
                newValue)
        {
            String numTrip = field1.getText();
            String airFare = field2.getText();
            String miles = field3.getText();
            String confCost = field4.getText();
            String lodgingCost = field5.getText();
            String foodCost = field6.getText();

            if (airFare.trim().equals( "")  )
            {
                submitButton.setDisable(numTrip.trim().equals( "") ||miles.trim().equals( "") || confCost.trim().equals( "")||
                        lodgingCost.trim().equals( "")|| foodCost.trim().equals( ""));
            }

            else if (miles.trim().equals( "") )
            {
                submitButton.setDisable(numTrip.trim().equals( "") ||airFare.trim().equals( "") || confCost.trim().equals( "")||
                        lodgingCost.trim().equals( "")|| foodCost.trim().equals( ""));
            }

            else
            {
                submitButton.setDisable( true);
            }


        }
    };




    public static void main(String[] args) {
        launch(args);
    }
}

3. Suppose that the production function is CobbDouglas with parameter α = 0.3.

a. What fractions of income do capital and labour receive?

b. Suppose that immigration raises the labour force by 10 percent. What happens to total output (in percent)? The rental price of capital? The real wage?

c. Suppose that a gift of capital from abroad raises the capital stock by 10 percent. What happens to total output (in percent)? The rental price of capital? The real wage?

please explain it like how to they get digits from suddenly out of no where

d. Suppose that a technological advance raises the value of the parameter A by 10 percent. What happens to total output (in percent)? The rental price of capital? The real wage?

String is wrapped around an object of mass M = 0.3 kg and moment of inertia I = 0.01 kg·m2. You pull the string with your hand straight up with some constant force F such that the center of the object does not move up or down, but the object spins faster and faster (see the figure). This is like a yo-yo; nothing but the vertical string touches the object. When your hand is a height y0 = 0.26 m above the floor, the object has an angular speed 0 = 14 radians/s. When your hand has risen to a height y = 0.66 m above the floor, what is the angular speed of the object? Your answer must be numeric and not contain the symbol F.

The proportion of customers who do online shopping is believed to be 0.3. A survey of49 customers was taken. They were asked if they did online shopping. A. What is the probability of the sample proportion to be below 0.25? B. What is the probability that the sample mean is above 0.35? C. What is the role of the central limit theorem in solving this problem?