Z-Scores & Z-tables

Front

What is a Z-score?

Back

A Z-score indicates how many standard deviations an element is from the mean of a data set.

Front

How is the Z-score calculated?

Back

Front

What does a Z-score of 0 represent?

Back

A Z-score of 0 indicates that the data point is exactly at the mean.

Front

What does a positive Z-score indicate?

Back

A positive Z-score indicates that the data point is above the mean.

Front

What does a negative Z-score indicate?

Back

A negative Z-score indicates that the data point is below the mean.

Front

What is the mean in a normal distribution?

Back

The mean is the average of all data points and is the center of the normal distribution.

Front

What is the standard deviation in a normal distribution?

Back

The standard deviation measures the dispersion or spread of the data points around the mean.

Front

How do you interpret a Z-score of 1.5?

Back

A Z-score of 1.5 means the data point is 1.5 standard deviations above the mean.

Front

How do you interpret a Z-score of -2?

Back

A Z-score of -2 means the data point is 2 standard deviations below the mean.

Front

What is a Z-table?

Back

A Z-table shows the percentage of values to the left of a given Z-score in a standard normal distribution.