In 2011, when the Gallup organization polled investors, 32% rated gold the best long-term investment. But in
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In 2011, when the Gallup organization polled investors, 32% rated gold the best long-term investment. But in April of 2013 Gallup surveyed a random sample of U.S. adults. Respondents were asked to select the best long-term investment from a list of possibilities. Only 168 of the 650 respondents chose gold as the best long-term investment. By contrast, only 83 chose bonds.
- Suppose we want to keep the margin of error at 4%, and we still want to construct a 99% confidence interval. What is the necessary sample size?
- Based on the sample size obtained in part c, suppose 306 respondents chose gold as the best long-term investment. Compute the standard error for choosing gold as the best long-term investment. Compute and describe a 99% confidence interval in the context of the question.
- Based on the results of part d, do you think opinions about the value of gold as a long-term investment have really changed from the old 32% favorability rate, or do you think this is just sample variability? Explain.
Related Book For
Business Statistics
ISBN: 9780134705217
4th edition
Authors: Norean Sharpe, Richard Veaux, Paul Velleman
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