Ayesha wants to explore the effect of a social media campaign on brand awareness. Which data source should she approach with caution due to potential issues of incomplete data or small sample size?

Sales data collected from retail stores during the duration of the social media campaign.

Interview with the social media manager who ran the campaign and observed interactions with the brand.

Ayesha wants to explore the effect of a social media campaign on brand awareness. Which data source should she approach with caution due to potential issues of incomplete data or small sample size?

A research paper presenting results from a survey of 1000 consumers who engaged with the campaign.

Sales data collected from retail stores during the duration of the social media campaign.