After reading this chapter, you should be able to do the following:

• Explain how a distribution of sample means is created
• Explain how a random sample is obtained
• Determine the mean, the standard deviation, and the shape of a distribution of sample means
• Explain what the standard error of the mean measures
• Explain the central limit theorem and why it is important
• Explain the law of large numbers
• Compute a z for a sample mean
• Use the z for a sample mean and a unit normal table to determine how likely a given sample mean is to occur