2201_Quiz4_KEY

2201_Quiz4_KEY - Revised 2201_Quiz4_KEY EXST 2201 Quiz 4...

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Unformatted text preview: Revised 11/19/2009 2201_Quiz4_KEY.docx EXST 2201 Quiz 4 KEY Answers 1A. 0.367 Tips Answers 3A. 0.85, 0.89 99.5 − ( 0.65*150 ) Tips p= 150*0.65* (1 − 0.65 ) 1B. 0.115 90.5 − (...) 0.85 ˆ p = 302 3B. 1.28 340 = 0.89 z0.10 = 1.28 1 ... 1C. 0.282 3C. 2.06 99.5 − ... 105.5 − ... , ... ... z0 = 0.89 − 0.85 0.85* (1 − 0.85 ) = 340 2.06 2A. 0.56 1, 247 2, 208 3D. Reject the null. 2B. 544 2208*0.56 (1 − 0.56 ) 4A. z-Test of the proportion. Proportion follows the z-Curve 2C. No. np (1 − p ) < 10 4B. µ = 0.01 μ = μ0 = 0.01 2D. (0.54, 0.58) ⎛ 0.56*0.44 ⎞ 0.56 ± 1.75 ⎜ ⎟ ⎜ 2208 ⎟ ⎝ ⎠ 4C. µ ≠ 0.01 Changed means ≠ 4D. Do not reject the null. Page 1 of 2 Revised 11/19/2009 2201_Quiz4_KEY.docx Answers 5A. psalk – pplacebo = 0, Tips psalk – pplacebo < 0 psalk should be less than pplacebo 33 5B. 0.165, 0.575 5C. –8.49 200 115 200 0.165 0.575 z0 = ( 0.165 − 0.575) 1⎞ ⎛1 0.37 * (1 − 0.37 ) * ⎜ + ⎟ ⎝ 200 200 ⎠ = −8.49 5D. (–0.52, –0.30) ( 0.165 − 0.575) ± 2.57 .165* (1 − .165 ) .575* (1 − .575 ) + 200 5E. Yes. 200 –8.49 < –2.33 ⇒ REJ H0 ⇒ Significantly Different Page 2 of 2 ...
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