When a store visit happens, the data is validated through a panel of users who volunteer to participate in Google Opinion Rewards. How many users volunteer?

Analysis of Correct Answer(s)

The correct answer is 5 million. Google uses a large, global panel of users from its Google Opinion Rewards program to validate the accuracy of its store visit conversion data.

• Validation Process: To ensure the accuracy of store visit data, which is modeled from users who have opted into Location History, Google sends surveys to a subset of these users. These surveys ask users to confirm their recent store visits.
• Panel Size: The effectiveness of this validation depends on a large and diverse user panel. Google has confirmed that this panel is comprised of over 5 million volunteers. This massive scale provides a statistically significant sample size, which is essential for calibrating and validating the models that report store visits with high confidence.

Analysis of Incorrect Options

• 1 million, 500,000, and 100,000: These options are incorrect because they underrepresent the actual size of the validation panel. A smaller panel would not provide the necessary scale and diversity to accurately validate store visit data across the vast number of advertisers, locations, and user segments that Google's system covers. The larger 5 million user panel is a key element that underpins the reliability of this measurement feature.