FUNDRAISING MANUAL - WHO

After 4 years, those who received aspirin had significantly fewer heart attacks than those who took no aspirin. 63. What are the experimental units in this scenario? Heart attacks b) Aspirin and Placebo c) Years d) Doctors. 64. How many factors are there? one, with two levels b) two, with one level each. c) 22,000 with two levels d) 11,000 with ... ................
................