A survey of Arizona drivers is described in the article "Study Claims Safety Should Be Made Law."The following statement is from the article.

According to the annual survey, which aims to gauge the opinions and concerns of the motoring public across the state regarding traffic safety, Arizona drivers want better traffic safety laws. The survey showed that nine in10 Arizonans91 percentfavor a statewide ban on texting while driving for all drivers, and abouttwo-thirds64 percentfavor a primary seat belt law.

The article also describes how the data for this survey were collected. A survey was mailed to 2,500 randomly selected AAA Arizona members (AAA Arizona is an automobile club that provides services to approximately860,000 membersin Arizona). The article did not indicate how many of the surveys were actually returned.

The results of this survey were generalized to all Arizona drivers. Answer the following four questions for this observational study. (Hint: Reviewing Examples 1.4 and 1.5 might be helpful.)