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Q: How do i construct a 99 confidence interval?

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No, it is not. A 99% confidence interval would be wider. Best regards, NS

Confidence level 99%, and alpha = 1%.

ss

4.04%

The parameters of the underlying distribution, plus the standard error of observation.

Never!

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.

The confidence interval becomes wider.

Why confidence interval is useful

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

No. The width of the confidence interval depends on the confidence level. The width of the confidence interval increases as the degree of confidence demanded from the statistical test increases.

2.326 (one sided) or 2.578 (two sided)

how are alpha and confidence interval related

Confidence intervals represent an interval that is likely, at some confidence level, to contain the true population parameter of interest. Confidence interval is always qualified by a particular confidence level, expressed as a percentage. The end points of the confidence interval can also be referred to as confidence limits.

The confidence interval is not directly related to the mean.

The confidence interval becomes smaller.

no,these are not the same thing.The values at each end of the interval are called the confidence limits.

Typically, the mean is the center and the interval extends a fixed number of standard-errors-of-the mean in wither direction. M+/- 1 SEM for example. I guess because you don't know, I should give you the simplest.

A confidence interval of x% is an interval such that there is an x% probability that the true population mean lies within the interval.

The mean plus or minus 2.576 (4/sqr.rt. 36)= 1.72 So take your average plus or minus 1.72 to get your confidence interval

The width of the confidence interval increases.

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The Z-value for a one-sided 91% confidence interval is 1.34

Generally speaking an x% confidence interval has a margin of error of (100-x)%.

Narrow because there is less of a chance for people to mess up