ECON 2500 Chapter Notes - Chapter 1-7: Random Variable, Standard Normal Deviate, Confidence Interval

• School: York University
• Department: Economics
• Course: ECON 2500
• Professor: Xianghong Li

Document Summary

~ (0,1) x s x y y i s y. If a and b are disjoint, ( c. General addition rule for unions of two events. Definition: mean and variance of a discrete random variable. Suppose that x is a discrete random variable whose distribution is. The mean of x is defined as x p k k. 2 n np (1 p p p (1 n. Draw an srs of size n from any population with mean and finite standard deviation . When n is large, the sampling distribution of the sample mean x is approximately normal: n a. The random variable t has degrees of freedom. The random variable t has degrees of freedom 1 n n . November 16, 2007 1:29 p. m. moore page t-2. November 16, 2007 1:29 p. m. moore page t-3. Table entry for z is the area under the standard normal curve to the left of z. November 16, 2007 1:29 p. m. moore page t-11.