When research subjects respond to the attention they are receiving from researchers, this is referred to as the effect?

It alludes as Hawthorne Effect. The Hawthorne impact is a kind of reactivity in which people adjust a part of their conduct in light of their consciousness of being watched. 

This impact was watched for minute increments in the light. In these lighting considers, light power was changed to analyze its impact on specialist profitability. Most modern/word related brain science and authoritative conduct course books allude to the brightening examines.

The answer is 2.7!