please describe the target population, sampling frame, sampling unit, and obersvation unit for this survey.

Also discuss any possible sources of selection bias or inaccuracy of responses

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 They were shown copies of unpublished "Harlequin Presents" novels with the Harlequin name hidden; over 50% identified the novel as a Harlequin product