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Sample Size for Surveys - Estimation 

If the objective is an estimation, just the value is not sufficient. It must be accompanied by a confidence interval (CI). A x% CI means  " If another survey is taken with the same characteristics as this, then the point estimate will be x% of the times inside this interval."  The percentage is generally 95% but it can be 90% or 99%. Together with the confidence, we specify the width of the interval. "i.e. the width of the 95% confidence interval will be the estimated value Plus/minus 5%(d) or plus/minus 10% of the estimation(e)"