You have a hypothesis that any day Apple announces a new product, Apple's share price increases significantly.

To determine whether this hypothesis is true or not, which of the following data would you want to analyze to test your hypothesis? Choose two and explain your reasoning.

1. Stock price fluctuations on days Apple made a new product announcement II. Stock price fluctuations on days Apple did not make a new product announcement III. Corporate announcements on days when Apple's share price increased significantly IV. Corporate announcements on days when Apple's share price did not increase significantly