You want to estimate the average number of U.S. states that people living in the United States have visited..If you asked only those that were at least 40 years old would you expect the estimate to be too high or too low? What kind of estimate would you expect if you select your sample only from those living in Rhode Island?

The estimate would be too high because as people with more age they tend to have more travel history compared to the younger ones which should have traveled less on average. Age would provide the necessary papers/requirements for traveling as well as the capability to find a vehicle for travel with enough knowledge of the places in the states.

If only people in Rhode Island were chosen then they are more likely to have visited more states than others because of the size of the state. Its accessibility to other states also increases the likelihood of travelling to other states.