Mathematics, 06.07.2019 01:20 lola78830
Aresearcher wants to know if the average time in jail for robbery has increased from what it was several years ago when the average sentence was 7 years. he obtains data on 400 more recent robberies and finds an average time served of 7.5 years. if we assume the standard deviation is 3 years, a 95% confidence interval for the average time served is:
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