The following regression output is available. Notice that some of the values are missing. 
Given this information, what was the sample size used in the study?
Definitions:
Microblogs
A form of blogging where users publish short text updates, often limited in character count, to share news, thoughts, or updates.
Corporate Voice
The unique, consistent expression of a company’s brand identity and values through its communication efforts.
User Authentication
The process of verifying the identity of a user attempting to access a system or application.
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