8.1 What is a sampling distribution

• notation used to describe the sample statistics and population parameter 
• 5 sizes of sampling distribution 
• sampling error - the error introduced because a random sample is used to estimate a population parameter. 
• n= sample size u = population mean 
• x bar = sample mean 
• the distrubution of a sample means is the distrubution that results when we find the means of all possible samples of a given size 
• the larger the sample size, the more closely this distrubution apporximates a normal distrubution 
• z= x- x bar/s 
• what is the mean of the distrubution of sample? its the pupulation mean 
• z score = sample proportion - pop. proportion/standard deviation 
• 9-17 odd