Mathematics, 10.12.2019 04:31 roperbailey
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, what is the p-value of the test?
Answers: 2
: average time in jail for robbery is same as it was several years ago 
: average time in jail for robbery has increased from what it was several years ago 
where 
≈3.33
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