Unformatted text preview: X i is the binge drinking percentage at ith campus which is distributed normally with mean 40 and standard deviation of 14 , i.e. X i ∼ N (40 , 14 2 ) . Since binge drinking percentages in different campuses should be independent, X i ’s should be assumed to be independent random variables. 4. X 1 , ··· ,X n form a random sample if X i are independent and identically distributed random variables. A statistic is a random variable. Hence sample mean ¯ X = ∑ n i =1 X i /n is a statistic. It will be distributed as ¯ X ∼ N (40 / 140 , 14 2 / 140) . Note. Read section 5.4, 5.5 and do Ex.5.48. 5.52. 5.63. Lecture 24 will be based on sections 6.16.2....
View
Full Document
 Fall '04
 Chung
 Statistics, Standard Deviation, Probability theory, Drinking culture, Binge drinking, Moo K. Chung

Click to edit the document details