5.2 Sample Means
Averages are less variable than individual observations.
Averages are more normal than individual observations
The Distirbution of a Sample Mean
o The sample mean from a sample or an experiment is an estimate of the
mean of the underlying
6.1 Estimating with Confidence
The sample mean is the natural estimator of the unknown population mean .
The law of large numbers says that the sample mean must approach the
population mean as the size of the sample grow.
o 95% confi
SESP 210: Introduction to Statistics and Research Methodology
Problem Set 7
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500
persons is drawn, of whom 194 turn out to be currently enrolled in colle