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QUESTION
A sociologist wants to estimate the mean time between date of indictment and the date of trial for persons charged with a criminal offense in New...
A sociologist wants to estimate the mean time between date of indictment and the date of trial for persons charged with a criminal offense in New York State. How many records should be sampled in order for the sample mean to be within 4 days of the population mean with 95% confidence? You may assume that most of those charged wait between 320 and 400 days.
Estimate σ by R/4 = 80/4 = 20 days.