No, it is not. A 99% confidence interval would be wider. Best regards, NS
Confidence level 99%, and alpha = 1%.
The parameters of the underlying distribution, plus the standard error of observation.
Why confidence interval is useful
The confidence interval becomes wider.
if the confidence interval is 24.4 to 38.0 than the average is the exact middle: 31.2, and the margin of error is 6.8
how are alpha and confidence interval related
You probably mean the confidence interval. When you construct a confidence interval it has a percentage coverage that is based on assumptions about the population distribution. If the population distribution is skewed there is reason to believe that (a) the statistics upon which the interval are based (namely the mean and standard deviation) might well be biased, and (b) the confidence interval will not accurately cover the population value as accurately or symmetrically as expected.
2.326 (one sided) or 2.578 (two sided)