Unquantified impact
I see that you reviewed data, but I don't know what the data said or how your summary was used.
From your resume
“Reviewed weekly email campaign results in spreadsheets and shared a summary with the marketing manager.”
If you have it
If your summary led to a specific change—like adjusting send times or changing subject lines—state that outcome.
Rewrite
Analyzed weekly email campaign performance in Excel and presented summaries that informed [specific marketing decision].
Anything in square brackets is something only you know.
If you don’t
If you just passed the numbers along, focus on the volume of data or the specific metrics you tracked (e.g., open rates, click-through rates).