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Time/CNN voter polls monitored public opinion for the presidential candidates during the 2000 presidential election campaign. One Time/CNN poll conducted by Yankelovich Partners, Inc., used a sample of n = 589 likely voters (Time, June 26, 2000). Assume the population proportion for a presidential candidate is p = 0.50.The questions below concern the sample proportion of likely voters favoring the presidential candidate.
(a) What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.04 of the population proportion?
(b) What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.03 of the population proportion?
(c) What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
(d) Suppose the sample size is increased from n = 589 to n = 1,178.With this new, larger sample size, what is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
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