To test the effects and side-effects of a new drug, researchers randomly assigned 300 volunteers to two treatment groups. For six months, the first group took 20mg of the drug while the second it K group took a placebo. At the end of the six months, the volunteers reported how many headaches they had experienced. Do the researchers have strong evidence that the drug increases the average number of headaches experienced? Let uy = the mean number of headaches experienced by volunteers taking the drug and u2 = the mean number of headaches experienced by volunteers taking the placebo. What are the hypotheses? O A. Holy = H2 Hail # H2 OB. Ho:H1 = H2 Haily H2 OD. HO:H1 # H2 Hail1 = H2 Based on the design of the study, if significant results are found, why can we conclude that the drug CAUSED a difference in the average number of headaches experienced? O A. Because the sample sizes are small O B. Because this is an observational study O C. Because the sample sizes are large D. Because this is an experimental study To conduct this test using the t-distribution, what conditions must be met? A. At least one of the samples must have a sample size of at least 30. B. Neither sample can show any signs of skew. Ar Bath enmaine must havin camein size of at lanet 20 or hain An nutrame antline Time Remaining: 00:19:10 Next