1. What is a z score?
2. What is the purpose of a z score?
3. If a z score were -3, where on the
graph would it be? Is this a rare or a common score? Why?
One way to find probabilities from a Standard Normal Distribution is to use probability tables, which are located inside the front cover of your textbook.
4. According to the table, what is the probability when z ≤ -1.23? The probability when z ≤ 1.23?
5. Select two other pairs of "opposites" on the z table (like 2, -2 etc.) and give their probabilities.
6. Show the math of adding each of the pairs. What is the total each time? Why is that the total?
7. What are the properties of the Standard Normal Probability Distribution?