Z-Scores & Z-tables

Front

What is a Z-score?

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 of the data set.

Front

How do you interpret a positive Z-score?

Back

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

Front

How do you interpret a negative Z-score?

Back

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

Front

What is the purpose of 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.

Front

What is the mean in a standard normal distribution?

Back

In a standard normal distribution, the mean is 0.

Front

What is the standard deviation in a standard normal distribution?

Back

In a standard normal distribution, the standard deviation is 1.

Front

Calculate the Z-score for a value of 70, given a mean of 52 and a standard deviation of 6.

Back

Front

If the mean is 20 and the standard deviation is 3, what is the Z-score for 23?

Back

Front

If a student scores 88, the class average is 78, and the standard deviation is 5, what percent of students scored higher than the student?

Back

2.5% of students scored higher than the student.