Stats Lesson 2.1 - GOOD

Front

What is a z-score?

Back

A z-score indicates how many standard deviations an element is from the mean. It is calculated as (X - Mean) / Standard Deviation.

Front

How do you calculate the z-score for a given value?

Back

Z-score = (X - Mean) / Standard Deviation.

Front

What does a positive z-score indicate?

Back

A positive z-score indicates that the value is above the mean.

Front

What does a negative z-score indicate?

Back

A negative z-score indicates that the value is below the mean.

Front

What is the formula for finding the percentile of a data set?

Back

Percentile = (Number of values below X / Total number of values) * 100.

Front

How do you find the median of a data set?

Back

To find the median, arrange the data in ascending order and locate the middle value. If there is an even number of values, average the two middle values.

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

Front

What happens to the median when a constant is added to all values in a data set?

Back

The median increases by that constant.

Front

What is the effect of adding a constant to all values on the standard deviation?

Back

The standard deviation remains unchanged when a constant is added to all values.

Front

What does the 55th percentile mean?

Back

It means that 55% of the data points are below that value.