1. The confidence level, via the critical value; The critical value will essentially be determined from one of two probability distributions: the standard normal distribution, or z − score; the t
The interval is calculated using the following steps: Gather the sample data. Calculate the sample mean x̅. Determine whether a population’s standard deviation is known
We are computing intervals for p = 5 means. The error rate for each interval will be .05/5 = 1%. We might use the Excel command = TINV (.01,24) to find that the multiplier = 2.797. In SAS, we use
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