Many scholars and policymakers are interested in the proportion of homeless peop

Question

Many scholars and policymakers are interested in the proportion of homeless people who are mentally ill. Wright (1988) estimates that 33 percent of all homeless people are mentally ill, by sampling homeless persons who received medical attention from one of the clinics in the Health Care for the Homeless (1HCII) project. He argues that selection bias is not a serious problem because the clinics were casily accessible to the homeless and because the demographic profiles of HCH clients were close to those of the general homeless 6 population in each city in the sample. Do you agree? 7 Approximately 16,500 women returned the Healthy Women Survey that appeared in the September 1992 issue of Prevention. The May 1993 issuc, reporting on thc survey, stated that "ninety-two percent of our readers rated their health as excellent, very good or good." A survey is conducted to find the avcrage weight of cows in a region. A list of all farms is available for the region, and 50 farms are selected at random. Then the weight of each cow at the 50 selected farms is recorded. 8 The Arizona Intrastate Travel Committee commissioned a study to identify in-state travel patterns of Phoenix and Tucson residents and to evaluate different sources of vacation planning information. They conducted 400 interviews with Phoenix resi dents and 400 interviews with Tucson residents. Telephone numbers with Phoeni:x and Tucson exchanges were generated randomly so that listed and unlisted telephone numbers could be reached·"Respondents were limited to heads of household and quotas were established in order to have an equal represcntation of male and female respondents. Additionally, income and age brackets were monitored in order to main- tain the same proportions as the general population bases of metropolitan Phoenix and Tucson" (Arizona Office of Tourism 1991). 9 The following letter to the editor appeared in the December 10, 1995, issue of the Appleton Post-Crescent: "Paul Harvey, God bless him, has started a nationwide sur vey being conducted by independent radio stations through their talk show hosts to determine the real sentiments of the American people relative to the sending of troops to Bosnia. So far, the results from one end of the nation to the other average out to over 90% against." 10

Explanation / Answer

Dear student,

According Chegg guidelines,only the first question is answered.

6, I agree, because the clinics we're easily accessible to the homeless people and also the demographic profiles of HCH clients were close to the general homeless population in each city . Thus,the possibility of selection bias is ruled out.

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