what statistics do you think are important to consider as to why the survival rate was higher for spouse to spouse transfer? Can you find any research that supports this claim or may help understand why this is the case? What other variables do you think should be considered? How could you use the test of hypothesis for a difference in two proportions (percentages, rates) to establish a null and alternative hypothesis? Define each population and then state what you would test. Which level of significance would you choose? Why?