This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Simple Random Sampling (continued) Scheaffer et al. in Chapter 4 of their book considered the following case study as part of application of simple random sampling. To find out if Americans are consuming less alcohol, a Gallup poll of approximately 1200 Americans conducted in early 1994. The goal was to determine if the consumption of alcoholic beverages was declining, and if there is any gender difference in drinking habits. Two of the questions and the resulting data from this poll are reproduced below. I have a few questions about alcoholic beverages....Do you have occasion to use alcoholic beverages such as liquor, wine, or beer, or are you a total abstainer? Table 1: Percentage Who Drink, by GenderTrend Total Men Women 1994 June 3-6 65 70 61 1992 64 72 57 1990 64 64 51 During the past five years, has your consumption of alcoholic beverages increased, decreased, or stayed about the same? Table 2: Percentage Consumption Changes over Past 5 YearsTrend June 1984 June 1994 Increased 11 7 Decreased 29 41 Stayed the same 51 51 No opinion 5 1 Total 100 100 Has the proportion of men who drink decreased significantly since 1992? Has the propor- tion of women who drink increased significantly since 1992? Has the overall proportion who have decreased drinking in the past 5 years changed since 1984? Is the proportion 1 who have stayed the same in amount over the past 5 years significantly greater than the proportion who have decreased their amount of alcohol consumed? We will apply methods that we learn in chapter 2 and here to find answers to these questions. Some uses of sampling: 1. In auditing: Suppose a federal auditor is to examine the accounts for a city hos- pital. The hospital records obtained from a computer data file show a particular accounts receivable total, and the auditor needs to verify this total. If there are several thousands of patients open accounts in the hospital, the auditor cannot afford the time to examine every patient record to obtain a total accounts receiv- able figure. Hence the auditor must choose some sampling scheme for obtaining a representative sample of patient records. After examining the patient accounts in the sample, the auditor can estimate the accounts receivable total for the entire hospital. If the computer figure lies within a specified distance of the auditors es- timate, the computer figure is accepted as valid. Otherwise, more hospital records will be examined for possible discrepancies between the computer figure and the sampled data. A random sample may be taken....
View Full Document
This note was uploaded on 06/06/2011 for the course STAT 4260 taught by Professor Staff during the Spring '11 term at University of Georgia Athens.
- Spring '11