Lecture Notes Standard Error, Margin of Error, and ...

The z-values and t-values correspond to a given level of confidence and can be looked up in a table of z-score or t-score values. The z-value for a 95% confidence interval is 1.96, which can be used as an approximation of the t-value for larger sample sizes (for example with a sample size of 50 the difference between the two values is 2.3%). ................
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