Which of the following problems is NOT solved by using random-digit dialing in order to select a sample for a national survey?
A. Some people do not have telephones.
B. Some people have unlisted numbers.
C. It is a huge task to gather all the telephone directories for a national telephone survey.
D. The listings in telephone directories are somewhat out of date by the time the directory is published and they become more out of date as time passes.
Question 2
Suppose that a national survey was done to determine whether people favored or opposed stricter gun laws. The survey results indicated that 70 favored stricter gun laws, 23 opposed, and 7 were undecided. The accuracy level (or margin of error) for the survey was 3 and the confidence level was .05. Lets take the 70 figure for those who favored stricter gun laws: Which of the following is the best interpretation of this result?
A. There are 95 chances out of 100 that in the population from which the sample was selected the percentage who favor stricter gun laws is somewhere between 67 and 73.
B. There are 3 chances out of 100 that in the population from which the sample was selected the percentage who favor stricter gun laws is somewhere between 65 and 75.
C. There are 5 chances out of 100 that more than 3 of the respondents gave wrong answers to the question.
D. There are 5 chances out of 100 that this survey result is within 3 of the results that would be attained if the survey were done again immediately.
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