LESSON: Z-Scores

Z-Scores

In this lesson video you will:

• see the need for a method to help us find areas under the normal distribution curve besides the 68-95-99.7 Rule.
• recognize z-scores as a measure of how many standard deviations a data point is from the mean.
• understand the standard normal distribution curve in relation to z-scores.
• calculate z-scores and find their approximate location on the standard normal distribution curve.

Calculating Z-Scores

In this lesson video you will see 4 examples of how to calculate a z-score for a data set.

Z-Score Table

In this lesson video you will:

• be introduced to the z-score table.
• understand that the z-score table helps us find areas under the standard normal distribution curve.
• learn how to use the z-score table correctly to help answer questions.

Using a Z-Score Table (1)

In this lesson video you will see one example of how to use z-scores and the z-table to help us answer questions about data points that are not exactly (1, 2 or 3) standard deviations from the mean.

Using a Z-Score Table (2)

In this lesson video you will see one more example of how to use z-scores and the z-table to help us answer questions about data points that are not exactly (1, 2 or 3) standard deviations from the mean.

Using a Z-Score Table (3)

In this lesson video you will see an example of how to use the z-table to find the area under a curve between two z-scores.