Final answer:
In McCleskey v. Kemp, statistical evidence of racial bias was presented, the Supreme Court majority upheld the death penalty, while the dissent criticized the majority's disregard for the evidence of bias, and Justice Scalia agreed with the majority's decision.
Step-by-step explanation:
The evidence presented in McCleskey v. Kemp was statistical evidence of racial bias. The majority decision of the Supreme Court upheld the death penalty, stating that the statistical analysis was not sufficient to overturn the sentence on the grounds of racial discrimination. The dissent criticized the majority for not giving appropriate weight to the evidence of inherent bias, contending that the death penalty was being applied in a racially disproportionate manner. Justice Scalia concurred with the majority, arguing that the legal standards for proving racial discrimination had not been met in McCleskey's case.