Finding z-scores & using 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 do you calculate a z-score?

Back

Front

What does a z-score of 0 indicate?

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 purpose of a z-table?

Back

A z-table shows the percentage of values below a given z-score in a standard normal distribution.

Front

What percent of values are less than a z-score of -1?

Back

Approximately 15.87% of values are less than a z-score of -1.

Front

What percent of values are less than a z-score of 1?

Back

Approximately 84.13% of values are less than a z-score of 1.

Front

If a data set has a mean of 20 and a standard deviation of 3, what is the z-score for 23?

Back

Front

What is the relationship between the mean and median in a normal distribution?

Back

In a normal distribution, the mean, median, and mode are all equal.