Three different statistics are being considered for estimating a population characteristic. The sampling distributions of the three statistics are shown in the following illustration: 
Which statistic would you recommend?
Definitions:
Earned Media
Any publicity gained through promotional efforts other than paid media advertising, which can include word of mouth, buzz, reviews, news coverage, mentions, and social media endorsement.
White Paper
An authoritative report or guide that provides information or proposals on a specific issue, often used to educate readers or help people make decisions.
Instameets
Organised gatherings of Instagram users to meet in person, often to take photos and share them on the platform.
A photo and video-sharing social networking service that allows users to upload content which can then be shared with followers or a select group of friends.
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