Confidence interval for tax in all states
Question: A sample of 17 states has the cigarette taxes (in cents) listed:
112 120 98 55 71 35 99 124 62
150 150 55 100 132 20 70 93
Find the 98% confidence interval for this tax in all 50 states, the District of Columbia, and Puerto Rico.
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A study of 35 golfers showed that their average score was 92. The standard deviation of the sample was 5. Find the 95% confidence interval of the mean score for all golfers.
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Pizza Hut wishes to find the 90% confidence interval of the true mean cost of a medium "veggie" pizza. How large a sample is needed if the store manager wants to be accurate to within $0.10?
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Jim is married and files a joint return. Jim and his wife have two dependent children. They have AGI $30,000 and Itemized deductions of $11,900. What is 2013 Taxable income?
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An old study of 1000 people in Phoenix found that 27 were obese. Find the 99% confidence interval of the population proportion of persons living in Phoenix who are obese.
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