Which of the following are data?

Results of informal presidential candidate poll

A set of book titles written by author

List of dates and the average temperature for those dates

All of the Above

To determine which of the options are considered data, we need to understand what data is. Data refers to facts, statistics, or information that can be collected, recorded, and analyzed.

Let's examine each option:

1) Results of informal presidential candidate poll: Yes, this is considered data. It contains information about the preferences and choices of individuals in the poll.

2) A set of book titles written by an author: Yes, this is also data. It consists of information about book titles written by a specific author.

3) List of dates and the average temperature for those dates: Yes, this is data too. It provides information about specific dates and their corresponding average temperature.

Therefore, the correct answer is "All of the Above" since each option represents a different set of data.