Dotplots, Boxplots, Stemplots, Histograms

Front

What is a dotplot?

Back

A dotplot is a simple graphical display of data using dots. Each dot represents one data point, and dots are stacked vertically to show frequency.

Front

When is the median a better measure of center than the mean?

Back

The median is a better measure of center when the distribution is strongly skewed.

Front

What is a boxplot?

Back

A boxplot is a standardized way of displaying the distribution of data based on a five-number summary: minimum, first quartile (Q1), median, third quartile (Q3), and maximum.

Front

What does a stemplot represent?

Back

A stemplot (or stem-and-leaf plot) displays quantitative data in a graphical format, similar to a histogram, while preserving the original data values.

Front

What is the purpose of a histogram?

Back

A histogram is used to represent the frequency distribution of numerical data by dividing the data into bins and counting the number of observations in each bin.

Front

How do you identify outliers in a boxplot?

Back

Outliers in a boxplot are typically represented as individual points that fall outside 1.5 times the interquartile range (IQR) above Q3 or below Q1.

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is the difference between the first quartile (Q1) and the third quartile (Q3) and measures the spread of the middle 50% of the data.

Front

What does skewness indicate in a distribution?

Back

Skewness indicates the asymmetry of a distribution. A right-skewed distribution has a longer tail on the right, while a left-skewed distribution has a longer tail on the left.

Front

How do you calculate the median of a data set?

Back

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

Front

What is the mode of a data set?

Back

The mode is the value that appears most frequently in a data set. A data set may have one mode, more than one mode, or no mode at all.