What is the correct research hypothesis?

1. Chapter One: Introduction to Statistics A scientist believes that early exposure to the drug Ritalin can lead to increased risk of cocaine addiction in adulthood. She conducts an animal study where one group of rats is exposed to Ritalin during development and the other is exposed only to a placebo. Then, after the animals mature, she exposes each group to cocaine and measures there level . of dependence on the drug. Use this example to answer questions 1-4. 1. What is the correct Research Hypothesis? Early exposure to Cocaine will lead to increase risk for Ritalin addiction in adulthood. O Early exposure to Ritalin will lead to an increased risk for cocaine addiction in adulthood. O Early exposure to Ritalin will have no effect on the risk for cocaine addiction in adulthood. Early exposure to Cocaine will lead to decrease risk for Ritalin addiction in adulthood. O Early exposure to Ritalin will lead to a decreased risk for cocaine addiction in adulthood. D Question 2 3 pts 2. What is the correct Null Hypothesis? Early exposure to Ritalin will lead to a decreased risk for cocaine addiction in adulthood. Early exposure to Cocaine will lead to increase risk for Ritalin addiction in adulthood. Early exposure to Ritalin will lead to an increased risk for cocaine addiction in adulthood. Early exposure to Cocaine will lead to decrease risk for Ritalin addiction in adulthood. O Early exposure to Ritalin will have no effect on the risk for cocaine addiction in adulthood.3 pts D Question 3 3. Which is the Independent Variable? Exposure to Ritalin during development. O The rats that got the Ritalin Adult cocaine users. O Level of cocaine dependence in adulthood. O Children who are on Ritalin. D Question 4 3 pts 4. Which is the Dependent Variable? O Adult cocaine users. O Level of cocaine dependence in adulthood. O Exposure to Ritalin during childhood. O The rats that got the Ritalin Children who are on Ritalin. D Question 5 3 pts