describe the target population, sampling frame, sampling unit, and observation unit. Discuss any possible sources of selection bias or inaccuracy of response

20 Ebersole (2000) studied how students in selected public schools describe their use of the Internet. Five school districts in a Western state were selected to give a cross- section of urban and rural schools that have Internet access. A survey, administered electronically, was installed as the home page in middle and high school media centers in the districts for a period of time to gather approximately 100 responses from each school. Students who had parental permission to access the Internet were permitted to access the computer-administered survey. Participation in the survey was voluntary