What is confidence interval conceptually?

< 1 min read

Confidence interval is a statistical range that likely contains the true population value based on sample data.
In one project, we estimated average monthly customer spend using a sample of users.
Instead of giving a single number, we provided a range, for example ₹4,500 to ₹5,200.
We stated it with 95% confidence, meaning we are highly confident the true average lies within that range.
This helped stakeholders understand uncertainty instead of relying on a single estimate.
I used Excel to calculate mean, standard deviation, and margin of error.
It was useful during A/B testing to validate if performance differences were significant.
Conceptually, confidence interval helps in risk-based decision making using data.

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