1. Schizophrenia. In the schizophrenia study in Section 2.1.2, the observations in the two groups (schizophrenic and nonschizophrenic) are not independent since each subject is matched with a twin in the other group. Did the researchers make a mistake?
2. True or false? A statistical computer package will only print outa p-value or confidence interval if the conditions for its validity are met.
3. True or false? A sample histogram will have a normal distribution if the sample size is large enough.