1. A criminologist is interested in determining whether prison terms differ for white and black defendants convicted of burglary. She selected at random 18 records of burglary
convictions and compared the prison terms for the 10 white convicts and 8 black convicts
in the sample. The sentence lengths (in years) are shown in the table below. Using these
data, test the null hypothesis at the .01 a level that white and black defendants convicted
of burglary do not differ in sentence length.