Box plots, dot plots and Histograms

Front

What is a box plot?

Back

A box plot is a graphical representation of a dataset that displays the median, quartiles, and potential outliers. It shows the distribution of data based on a five-number summary: minimum, Q1 (lower quartile), median, Q3 (upper quartile), and maximum.

Front

What does the term 'lower quartile' (Q1) refer to?

Back

The lower quartile (Q1) is the median of the lower half of a dataset. It represents the value below which 25% of the data falls.

Front

How do you find the median of a dataset?

Back

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

Front

What is a dot plot?

Back

A dot plot is a simple graphical display of data where each data point is represented by a dot above a number line. It is useful for showing the frequency of data points.

Front

What is a histogram?

Back

A histogram is a graphical representation of the distribution of numerical data, where the data is divided into bins (intervals) and the frequency of data points in each bin is represented by the height of bars.

Front

How do you interpret a box plot?

Back

In a box plot, the box represents the interquartile range (IQR), the line inside the box indicates the median, and the 'whiskers' extend to the minimum and maximum values, excluding outliers.

Front

What is the purpose of using a histogram?

Back

Histograms are used to visualize the distribution of data, identify patterns, and understand the frequency of data points within specified ranges.

Front

How can you determine the number of outliers in a box plot?

Back

Outliers in a box plot are typically defined as data points that fall below Q1 - 1.5 * IQR or above Q3 + 1.5 * IQR, where IQR is the interquartile range.

Front

What does the term 'median' refer to in statistics?

Back

The median is the middle value of a dataset when arranged in ascending order. It divides the dataset into two equal halves.

Front

How do you calculate the interquartile range (IQR)?

Back

The interquartile range (IQR) is calculated by subtracting the lower quartile (Q1) from the upper quartile (Q3): IQR = Q3 - Q1.