Exam 5: Sampling: Surveys and How to Ask Questions

One problem with using random digit dialing to get a representative sample of households in a city is that

During the graduation ceremonies, a student who writes for the school newspaper decides to sample some of the graduating seniors for a quick survey. After the students receive their diploma and step off the stage, he will ask them the question: "Have you already been accepted to college at this point?" What sample size would be needed to provide a margin of error of about 10%?

Use the following information for questions: The next question are based on the following row of digits from a random number table. Use these digits to select a random sample following steps 1 through 4 in the text. 00157 $\quad$ 37071 $\quad$ 79553 $\quad$ 31062 $\quad$ 42411 $\quad$ 79371 $\quad$ 25506 $\quad$ 69135 -Suppose that a group of 50 students are numbered from 01 to 50. Draw a simple random sample of 5 students by starting with the digit 15 from the first string of digits 00157. Which 5 students would be selected?

For the Literary Digest poll of 1936 the magazine sent out questionnaires to 10 million people, of whom 2.3 million answered the questionnaire. What was the main problem with this poll?

A survey based on a random sample of 1000 students found that 1% of these students, when asked by the professor doing the survey, admitted to having cheated on at least one exam. The results of this study, if applied to all students in the university, are questionable because of

A population of taxpayers is divided into five income levels and a simple random sample is selected from each one for an audit. This is an example of a _________ sample.

The following statement that was provided as part of the fine print at the end of the reported results of a survey: "In addition to sampling error, question wording in conducting surveys can introduce error or bias into the findings of public opinion polls." What is the type of bias being referred to here?

A random sample of 1001 Americans aged 18-24 years showed that 51% believe their health is extremely important. An approximate 95% confidence interval for the proportion of all 18-24 year olds who believe that their health is extremely important is

Use the following information for questions: The Michigan Department of State Police keeps track of the number of points received for various traffic violations by Michigan drivers. The department is interested in examining the relationship between the number of points received and the insurance premium. The following chart shows the number of drivers in each category of points according to the records from last year. The department will take a simple random sample of 3% of the drivers in the Low category and 2% of the drivers in the other two categories. -What sampling method will be used to obtain the sample?