A scientist is studying how a new treatment affects Alzheimer's Disease in mice. Which table of shows the independence of disease status and mouse group within the collection of mice observed? Notice that the tables differ in the probabilities for Group 2. Table A Degrade Improve Total Group 1 5 15 20 Group 2 20 60 80 Total 25 75 100 Table B Degrade Improve Total Group 1 5 15 20 Group 2 25 55 80 Total 30 70 100 Only Table A Only Table B Both Table A and Table B Neither Table A nor Table B