# Unit6Vocabulary Flashcards

Skewed Left

Also known as negatively skewed, the bulk of the data items are clustered on the positive end of a graph with the long tail to the left.

Mean

The average value of all the data in a dataset. Calculated by adding up the values of all data items and then dividing by the number of items in the dataset.

z-score

A value indicating the number of standard deviations a data item is from the mean of its dataset.

Box and Whisker Plot

A graphical representation of the five number summary.

Upper Quartile

The median of the upper half of a dataset.

Bivariate

Two datasets used to measure correlation.

Strong Positive Correlation

Indicated by a correlation coefficient as defined below:

**{ r | 0.7 < r < 1 }**

Weak Negative Correlation

Indicated by a correlation coefficient as defined below:

**{ r | -0.1 < r < -0.3 }**

Weak Positive Correlation

Indicated by a correlation coefficient as defined below:

**{ r | 0.1 < 0.3 }**

Maximum

The largest data value in a dataset.

Neutral Positive Correlation

Indicated by a correlation coefficient as defined below:

**{ r | 0.4 < r < 0.6 }**

Correlation Coefficient

A statistical measure of how linear a bivariate dataset is. Typically represented with a lowercase r:

**{ r | -1 < r < 1 }**

Lower Quartile

The median value of the lower half of a dataset.

Skewed Right

Also known as positively skewed, the bulk of the data items are clustered on the negative end of a graph with the long tail to the right.

Histogram

A graphical representation of the clustering of a dataset based on a specified bin width and the number of data items within each bin.