2.1 Assignment*: Z-Scores

A z-score is a statistical measurement that describes a value's relationship to the mean of a group of values. It indicates how many standard deviations an element is from the mean.

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

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

Tori performed better because her z-score is more positive, indicating she is further above the mean.

The mean is the average of a set of values, calculated by adding all the values together and dividing by the number of values.

Standard deviation is a measure of the amount of variation or dispersion in a set of values. A low standard deviation means that the values tend to be close to the mean.

The symbol for standard deviation is σ (sigma).

The symbol for the mean is μ (mu).

A z-score of 0 means that the data point is exactly at the mean.