TA10 - ECO2121: Methods of Economic Statistics TA10 – 1...

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Unformatted text preview: ECO2121: Methods of Economic Statistics TA10 – 1 April 2009 1. Hypothesis Testing (continued) Example: 七成學生領袖曾接觸淫褻物 Given n = 324, x = 233, so ̂ = 0.72. 2. Confidence Interval (Two Populations) Motivation: for X ~ Bernoulli( p X ), p X is the only parameter, we can find both point and interval estimates of p X , as well as conduct hypothesis testing for p X . But if Y ~ Bernoulli( p Y ) independently, can we do the same for p X – p Y ? Example 1: if among the 324 students, there are 165 males and 159 females, denote X for male and Y for female, so n X = 165 and n Y = 159, and there are 137 males and 96 females who claim they experience pornographic materials in Internet, construct a 95% C.I. for p X – p Y . For a “ large ” sample, by CLT, ¡̂ ¢ ~ N ( p X , p X q X / n X ) and £̂ ¤ ~ N ( p Y , p Y q Y / n Y ) and assume they are independent (valid?), ¥̂ ¦ − §̂ ¨ ~ N ( p X – p Y , p X q X / n X + p Y q Y / n Y )....
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This note was uploaded on 11/16/2009 for the course ECO 2121 taught by Professor Professorwen during the Fall '08 term at Al Ahliyya Amman University.

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TA10 - ECO2121: Methods of Economic Statistics TA10 – 1...

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