The scatter diagram represents the percentage of the population with a bachelor’s degree, x, and teen birthrates (births per 1000 15- to 19-year-olds), y, for the 50 states and Washington, DC, in 2009. 

(a) The least-squares regression with Washington, DC, included is yn = -1.2688 x + 76.0284. The least-squares regression line with Washington, DC, excluded is yn = -1.9465 x + 93.4464. Do you think the point corresponding to Washington, DC, may be influential? Why?

(b) Washington, DC, often appears as an influential observation in regression analysis. What is it about Washington, DC, that makes it influential?

(c) Would you say that higher levels of education cause lower teen birthrates?

Transcribed Image Text:

Teen Birthrate vs Percent of the Population with Bachelor's Teen Birthrate 60 50 40 30 25 30 35 Percent with Bachelors 40 45