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Only if the true distribution does not change significantly through time. e.g. time series data. You don't want to be validating today's economics with economics from the 1950s.
People without a business background don't use excel. Period. And considering business graduates don't usually go into data science, you can understand the ignorance.
Reading comprehension guys. "We are interviewing for a data scientist position...", meaning he's not the employer. It is a group intervew. He's just judging the other candidate being interviewed.
