Someone has conducted a study to see if there is increased risk of getting lung cancer if you work in a coal mine. In group 1, 30 of the 150 coal miners got lung cancer. In group 2, 5 out of the 250 non- coal miners got lung cancer. What is the sample relative risk?

Which of the following  bestillustrates a negative reinforcer?               a.  copland gives up candy to stave off chronic acid indigestion.    b.  nancy learns that she prefers chocolate over vanilla.    c.  carmine changes his major to english lit after failing a math exam.    d.  on a hot day, lindberg always drinks lemonade.