Why marketing, and what kind of marketing work do you want to grow into?
I would answer honestly and with evidence. A strong answer names what drew me in, such as enjoying understanding why people choose one thing over another, and gives a small example from study, a society or a personal project where I saw results. I would then say which areas I want to explore first, for example content, analytics or customer research, and why, while showing I am open to learning where the team needs me. I would end with how I plan to build skills, through practice, feedback and relevant courses.
Tell me about a campaign that failed and what you changed.
Pick a real campaign where you owned the result, and be honest that it missed its goal. Describe the situation and what you expected to happen. Explain the hypothesis, what the data showed, and why you think it failed. Then say what you changed and how you tested it. Close with the result and the lesson. Good answers show you took responsibility, used evidence and turned the failure into a better next test.
How would you distinguish incremental sales from sales attributed to a campaign?
Say that attributed sales are simply those a campaign touched, while incremental sales are those that would not have happened without it. The best test is a holdout group that does not see the campaign. Compare it with a matched exposed group, and use past sales as a baseline. Watch for overlap with other channels, seasons and promotions. Report the lift as a range, not one exact number, and be honest about what you cannot know.
How do you balance short-term acquisition with long-term brand trust?
Show that you treat both as needed, not as a trade. Start by setting clear goals for growth and for trust, such as retention, referrals and complaints. Add guardrails, for example limits on discounting or aggressive messaging. Compare cohorts to see whether customers won by short-term offers stay as long as others. Listen to customer signals like reviews and support contacts. Split budget sensibly, review it often, and adjust when trust signals slip.