The strategy of the courtroom is a subtle thing. Common sense would say that a criminal who admits guilt is treated more leniently while a defiant criminal gets a harsher sentence. To see if this is...


The strategy of the courtroom is a subtle thing. Common sense would say that a criminal who admits guilt is treated more leniently while a defiant criminal gets a harsher sentence. To see if this is actually true, data was gathered from criminal courts to determine if criminals who plead guilty receive lighter sentences than those who plead guilty. Below is a small portion of that data set:


Sentence Served Plea


24 8.75 Not Guilty


33.5 6.5 Not Guilty


25.5 6.5 Guilty


18 12.5 Not Guilty


18.5 11 Guilty


44.5 14.5 Not Guilty


38.5 20 Not Guilty


50.5 22 Not Guilty


12.5 1 Guilty


102 10.75 Guilty


30 1.5 Guilty


The Variables are:



a) Sentence: Sentence Length (in months).



b) Served: Actual sentence served (in months).



c) Plea: either a not guilty plea or a guilty plea.


For this you should:



i) Perform a two sample
t-test (using
a
= 0.05) to compare the sentences given, and the sentences served, by those who plead guilty and those who do not. (So you’ll need to perform two separate two-sample
t-tests).



ii)
State and address all of the assumptions required for the
t-tests.



iii) Answer the question “Do criminals who plead guilty get more lenient treatment than those that plead not guilty?”



May 25, 2022
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