ng-2 angular observable

import {Component} from '@angular/core';
import {Observable} from 'rxjs/Observable';

@Component({
    selector: 'app',
    template: `
      <b>Angular 2 Component Using Observables!</b>
      <div>Values: {{values.toString()}}</div>
      <div>Errors? {{anyErrors}}</div>
      <div>Finished? {{finished}}</div>
    `
})
export class App {

  private data: Observable<Array<number>>;
  private values: Array<number> = [];
  private anyErrors: boolean;
  private finished: boolean;

  constructor() {
      this.data = new Observable(observer => {
          setTimeout(() => {
              observer.next(42);
          }, 1000);

          setTimeout(() => {
              observer.next(43);
          }, 2000);

          setTimeout(() => {
              observer.complete();
          }, 3000);
      });

      let subscription = this.data.subscribe(
          value => this.values.push(value),
          error => this.anyErrors = true,
          () => this.finished = true
      );
  }

}

I think line 15 should be

  private data: Observable<number>;

versus

  private data: Observable<Array<number>>;