Chapter 12 Solutions

xn 12 5 a p 25 04 b c the population proportion

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Unformatted text preview: the sample g. ̂ = x/n 12. 5 a. p = 2/5 = 0.4 b. c. The population proportion is marked by the vertical line below. d. ̂ ∑ ̂⁄ ⁄ e. The answer to part a and part d are the same. ̂ is a sample mean. The mean of the sampling distribution of ̂ is the same as the mean of the population, which is p. 12.23 ̂ ⁄ ̂ ; The 95% confidence interval is 12.26 ⁄ √ ̂( ̂) ( √ ) ( ) n = 1,516, x = 985, and n = x = 531. Both x and n = x are at least 5. ⁄ ̂ ⁄ a. √ ( )⁄ ( √ )⁄ b. We can be 95% confident that the percentage of Americans who drink beer, wine, or hard liquor, at l...
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This document was uploaded on 02/06/2014.

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