Statistics Study Guide

Front

What is a dot plot?

Back

A dot plot is a statistical chart that consists of dots plotted above a number line, representing the frequency of data points.

Front

How do you find the total number of votes in a dot plot?

Back

To find the total number of votes, count the number of dots in the plot.

Front

What is the inner quartile range (IQR)?

Back

The inner quartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set.

Front

How do you calculate the range of a set of numbers?

Back

The range is calculated by subtracting the smallest number from the largest number in the set.

Front

What is the median of a data set?

Back

The median is the middle value when the numbers are arranged in order. If there is an even number of values, the median is the average of the two middle numbers.

Front

What does it mean if a data set has no mode?

Back

A data set has no mode if no number appears more than once.

Front

What is a frequency table?

Back

A frequency table is a table that displays the number of times each value occurs in a data set.

Front

What is the purpose of a box plot?

Back

A box plot visually summarizes the distribution of a data set, showing the median, quartiles, and any outliers.

Front

How do you identify outliers in a data set?

Back

Outliers can be identified using the IQR method: any value that is more than 1.5 times the IQR above Q3 or below Q1 is considered an outlier.

Front

What is a histogram?

Back

A histogram is a graphical representation of the distribution of numerical data, using bars to show the frequency of data points in specified ranges.