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)⁄
√
√ 12.39 ( )⁄ We can be 95% confident that the proportion of U.S. adults who approved of the way that
President George W. Bush was doing his job was somewhere between 0.409 and 0.470.
12.56 ̂ = (150 + 2)/(500 + 4) = 0.302
The 99% oneproportion plusfour zinterval is
̃ ⁄ √ ̃( ̃ ) ⁄( ) √ ( )⁄ ( ) We can be 99% confident that the proportion of all U.S. adults who, at the time, oppose offshore
drilling for oil and natural gas in between 0.249 and 0.355.
12.59 a. The sample proportion is ̂ = x / n = 8 / 40 = 0.2
b. np0 =...
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 Spring '14
 Statistics

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