Jamieson and Romer (2008) evaluated children's beliefs concerning life expectancy in a diverse sample of American children. In their study, they reported at a 95% CI that "approximately 1 out of every 15 youth interviewed(6.7%[5.9%, 7.5%])responded that they agreed they would not live much past the age of 30."(a) What is the point estimate and interval estimate for these data?

point estimate_____________%

interval estimate________________% to _________________%

(b) If these researchers computed an 80% CI, how would this change the precision and certainty of their estimate?

• The estimate would be more precise but less certain.
• The estimate's precision and certainty would not change.
• The estimate would be less precise and less certain.
• The estimate would be less precise but more certain.
• The estimate would be more precise and more certain.