1. For each of the following cases, (i) state whether the study should be observational or experimental. (ii) state whether the study should be run blind, double-blind, or neither. If the study should be run blind or double-blind, who should be blinded? (a) An investigation of whether taking aspirin reduces one's change of having a heart attack. (b) An investigation of whether babies born into poor families are more likely to weigh less than 5.5 pounds at birth than babies born into wealthy fam- ilies. (e) An investigation of whether the size of the midsagit- tal plane of the anterior commissure (a part of the brain) of a man is related to the sexual orientation of the man. (d) An investigation of whether drinking more than 1 liter of water per day helps with weight loss for peo- ple who are trying to lose weight