Chapter 12 Solutions

S adults who approved of the way that president

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Unformatted text preview: terval is ( )⁄ √ √ 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% one-proportion plus-four z-interval 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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