Data Analyst Intern applicants have rated the interview process at Mercer with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 63.6% positive. This is according to Glassdoor user ratings.
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Interview asked about past experiences, knowledge of technical skills (comfort with handling large datasets), understanding of role and company, pretty standard interview, just be confident in what you know. Attitude is the most important, you gotta be willing to learn.