Gabby loves long-distance running, but her feet develop terrible blisters. Some of her track teammates suggest that the blisters are caused by her cotton socks, which absorb moisture. Gabby borrows a pair of double- layer running socks made of a synthetic blend. For two weeks she wears the synthetic socks when running, and for the following two weeks she switches back to the cotton socks when running. During this month, Gabby counts the number of blisters she develops. She finds that she develops only one blister while wearing the synthetic socks, but five blisters while wearing the cotton socks. I need the experiment group, control group, independent variable, dependent variable, possible conclusion, and improvement to the experiment using controlled variable ​