What potential sources of bias are present, if any? select all that apply. a. certain grids may have been much more severely damaged than others. the grids that are selected may not be representative in terms of damage. b. the sample only consists of grids that are easy to get. these grids may not be representative of the population. c. certain grids may have been much more severely damaged than others. severely damaged grids may have fewer occupied households. d. there are no potential sources of bias.

Ascientist successfully predicts the outcome of an experiment. you watch carefully and know he didn't cheat. the scientist's success shows that: a) the scientist knows absolute truth about this experiment; success is not possible unless you know the truthb) the scientist was just lucky; no one ever knows what's going on, so successful predictions require luckc) the scientist may know the truth, or at least know something that is close to the truth, or the scientist may have gotten lucky this time; you can't be absolutely sured) the scientist really was cheating, even though you didn't see the cheating; no one can get things right, except by cheatinge) the scientist spent the night at a particular hotel chain and go a free breakfast, giving the scientist the ability to do amazing things