1. State the assumptions
2. State the appropriate confidence interval formula 3. find
the confidence interval via calculator
4. write a full sentence for this interval
5. interpret the interval
Psychologists have found that twins, in their early years,
tend to have lower intel- ligence and pick up languages more slowly
than nontwins. The slower intellectual growth of twins may be
caused by benign parental neglect. Suppose we want to investigate
this phe- nomenon. A random sample of 50 sets...