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connect with SLOT/SIGNAL: QPushButton clicked signal not received by main window

I added a `QPushButton` to my ui file named `pushButton`, and manually connected it using `connect`. 

- There are no errors or warnings emitted at any point in the compilation stage
- The button does show up on the UI.
- When I click on the button, nothing happens.

MainWindow.cpp:

```
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(pushButton_Clicked));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::pushButton_Clicked()
{
    QMessageBox::information(nullptr, tr("Status"), tr("You clicked the button!"));
}
```

MainWindow.h

```
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

private slots:
    void pushButton_Clicked();
};

#endif // MAINWINDOW_H
```

What do I need to do to make `MainWindow::pushButton_Clicked()` get called when the button is clicked?