Module 1 Practice Questions (2)

Front

What is a boxplot?

Back

A boxplot is a graphical representation of a dataset that displays the distribution's minimum, first quartile (Q1), median, third quartile (Q3), and maximum. It helps identify outliers and the spread of the data.

Front

What does the interquartile range (IQR) represent?

Back

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

Front

How do you identify outliers in a dataset using the IQR?

Back

Outliers can be identified using the IQR by calculating the lower bound (Q1 - 1.5 * IQR) and the upper bound (Q3 + 1.5 * IQR). Any data points outside these bounds are considered outliers.

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 or intervals, and the frequency of data points in each bin is represented by the height of the bars.

Front

What is the purpose of a five-number summary?

Back

A five-number summary provides a quick overview of a dataset by summarizing its minimum, first quartile (Q1), median, third quartile (Q3), and maximum, helping to understand its distribution.

Front

What does the median represent in a dataset?

Back

The median is the middle value of a dataset when it is ordered from least to greatest. It divides the dataset into two equal halves.

Front

What is the significance of the first quartile (Q1)?

Back

The first quartile (Q1) is the value below which 25% of the data falls. It helps to understand the lower end of the data distribution.

Front

What is the significance of the third quartile (Q3)?

Back

The third quartile (Q3) is the value below which 75% of the data falls. It helps to understand the upper end of the data distribution.

Front

What type of data is best represented by a histogram?

Back

Histograms are best used for continuous numerical data, where the data can be grouped into intervals to show frequency distribution.

Front

What is the difference between categorical and numerical data?

Back

Categorical data represents categories or groups (e.g., colors, names), while numerical data represents measurable quantities (e.g., height, weight).