Brendan frequently comes home from soccer practice with muddy socks. Previous pr
ID: 144047 • Letter: B
Question
Brendan frequently comes home from soccer practice with muddy socks. Previous pretreatment techniques (such as presoaking in bleach) have not worked to remove the stains. Brendan had heard about a new uct that was advertised to completely remove mud stains by pretreating with the product for 24 hours. rendan was tired of wearing stained socks and hypothesized that the new product would get the mud stains out of his soccer socks. Which statement below describes the best experimental design to test the new product's effectiveness? Test new socks soiled with grape juice by pretreating one sock for 24 hours while leaving the other sock untreated. Test new socks worn once to soccer by pretreating one sock O for 24 hours while leaving the other sock untreate O 24 hours while leaving the other sock untreated. O Tirst with bleach and then new product for 24 hours while Test old socks stained previously by pretreating one sock for st new socks worn once to soccer by pretreating one sock leaving the other sock untreated Which of the following represents the control for Brendan's experiment? O O O O bleach pretreatment untreated old sock pretreated new sock untreated new sock Previous Give Up & View Solution Check Answer Next ExitExplanation / Answer
1. The best experimental technique would be to ' Test new socks worn once to soccer by pretreating one sock for 24 hours while leaving the other sock untreated'. Old socks will not yield proper results because as the stain gets older, it becomes more difficult to get rid off it. Using bleach will also make it difficult to review the efficiency of the new product. The first option involving grape juice should also be eliminated.
2. Untreated new sock. Because here there is no other interfering factors and hence it will act as a good standard against which the comparison can be made.