John K. answered 04/27/15
Tutor
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Improve your Statistics (even online), SPSS, Excel or Research papers.
A 95% confidence interval indicates that you have confidence that 95% of the time the population mean value will fall in that range of numbers. You can substitute 90% or 99% for the 95 above
The range gets wider with a higher confidence level, because it provides a "bigger net" for capturing the potential population mean. Higher confidence levels means that you are not willing to be wrong very often.