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

16 In lawsuits about trademarks, a plaintiff claiming that another company is infringing on its trademarks must often show that the marks have a "secondary meaning in the marketplacethat is, potential users of the product associate the trademarks with the plaintiff even when the company's name is missing. In the court case Harlequin Enterprises Ltd v. Gulf & Western Corporation (503 F. Supp. 647, 1980), the publisher of Harlequin Romances persuaded the court that the cover design for "Harlequin Presents" novels had acquired secondary meaning. Part of the evidence presented was a survey of 500 women from three cities who identified themselves as readers of romance fiction. They were shown copies of unpublished "Harlequin Presents" novels with the Harlequin name hidden; over 50% identified the novel as a Harlequin product. 20 Ebersole (2000) studied how students in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