Aresearcher assesses the length of the prison sentence for physically attractive and physically unattractive defendants. he believes that attractive defendants will receive shorter prison sentences than unattractive defendants. the null hypothesis would suggest that: a. there is no difference in the length of the prison sentence received by attractive and unattractive defendants. b. physically attractive defendants will receive longer prison sentences than physically unattractive defendants. c. physically attractive defendants will receive shorter prison sentences than physically unattractive defendants. d. some other variable such as gender is responsible for the difference in the length of prison sentence.