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Tag Archives: z score

Statistic Procedures – Confidence Interval


Confidence Intervals for One Population Mean A common problem in statistics is to obtain information about the mean, μ, of a population. One way to obtain information about a population mean μ without taking a census is to estimate it by a sample mean x(bar). So, a point estimate of a parameter is the value of a […]

How to compute the expected 95% CI


The Random Sampling Distribution of Means Imagine you have a hat containing 100 cards, numbered from 0 to 99. At random, you take out five cards, record the number written on each one, and find the mean of these five numbers. Then you put the cards back in the hat and draw another random sample, […]