A researcher randomizes 21 mice to either a low fat diet (n = 11) or a control diet (n = 10) and wants to compare lifespan between the two treatments. After 900 days, 18 of the 21 mice have died but the experiment ends, so all we know about the three remaining mice is that they lived longer than 900 days. Use this information to answer questions 11 - 13. Question 11 2 pt! If we entered \"900\" for the lifespan of the missing mice the estimated mean lifetime be biased. True 0 False Question 12 2 pt! If we entered \"900\" for the lifespan of the missing mice the estimated median lifetime be biased. 0 True 0 False Question 13 4 pt: If all we know about the last 3 mice is that they lived longer than 900 days, which of the following tests could validly be used to compare the lifespans between the two treatments? 0 Wilcoxon Signed Rank test 0 Sign test 0 Linear regression 0 Two sample t-test (unpaired) O Wilcoxon rank sum test