A researcher wants to determine the mean level of mercury found in 3 species of salt water shellfish: clam, oyster and crab. She randomly samples 100 shellfish of each species. She measures the amount of mercury in each specimen. 1. What is the experimental unit? [Select] 2. What is the response variable? [Select] 3. What is the factor? [Select] 4. What are the factor levels? [Select] > > > >

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