How many Google Opinion Rewards participants volunteer for panels that validate store visits?
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Correct answer: 5 million.
Why this is the answer
The correct answer is 5 million. Google Opinion Rewards has a panel of 5 million users who opt-in to validate store visits. This large panel allows Google to gather significant data on offline store visits, which is crucial for measuring the effectiveness of online ads in driving in-store traffic. The other options (500,000, 1 million, 100,000) are incorrect because they significantly underestimate the actual size of this volunteer panel, which is a key component of Google's ability to attribute offline conversions.
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