Mathematics, 20.12.2019 04:31 kemellgwilson
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 recent robberies and finds an average time served of 7.5 years. if we assume the standard deviation is 3 years, perform a significance test (calculating the p-value) at the 0.05 level.
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