Gallup reported in 2012 that 53% of American investors are likely to say the price of energy
Question:
a) Is the percentage in 2012 different from that in 2011? Test the appropriate hypothesis. Check conditions. Does the test provide evidence that the percentage has changed from 2011?
b) Find a 95% confidence interval for the sample Economic Confidence Index.
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Related Book For
Business Statistics
ISBN: 9780321925831
3rd Edition
Authors: Norean Sharpe, Richard Veaux, Paul Velleman
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