Question 1

Question 1Assertion. The matplotlib library of Python is used for data visualization.Reason. The PyPlot interface of matplotlib library is used for 2D plotting.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationThe Matplotlib library is used for data visualization in Python, providing a variety of tools and functionalities for creating different types of plots, charts, and graphs. The Pyplot module, which is a collection of methods within the Matplotlib library, allows users to construct 2D plots easily and interactively.

Question 2

Question 2Assertion. A scatter chart simply plots the data points on a chart to show the trend in the data.Reason. A line chart connects the plotted data points with a line.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true but R is not the correct explanation of A.ExplanationThe scatter chart is a graph of plotted points on two axes that show the relationship between two sets of data. On the other hand, a line chart, or line graph, is a type of chart that displays information as a series of data points called 'markers' connected by straight line segments.

Question 3

Question 3Assertion. Both scatter() and plot() functions of PyPlot can create scatter charts.Reason. The plot() function can create line charts as well as scatter charts.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationBoth the scatter() and plot() functions in Pyplot can create scatter charts. The plot() function in Pyplot can create both line charts and scatter charts. When specifying marker styles without providing a linestyle argument, the plot() function will create a scatter chart.

Question 4

Question 4Assertion. For the same sets of data, you can create various charts using plot(), scatter(), pie(), bar() and barh().Reason. All the data sets of a plot(), scatter(), bar() cannot be used by pie() ; it will work with only a single set of data.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

A is false but R is true.ExplanationWe can create various charts using plot(), scatter(), bar(), and barh() for the same datasets, but not using pie(). The pie() function specifically works with a single set of data, whereas the other functions can handle multiple datasets or series.

Question 5

Question 5Assertion. Five-point statistical summary of a data set can be visually represented.Reason. The boxplot() function can plot the highest and lowest numbers of a data range, its median along with the upper and lower quartiles.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationThe five-point statistical summary of a dataset can be visually represented through a box plot. A box plot is used to display the range and middle half of ranked data. It uses five important numbers from the data range: the extremes (highest and lowest numbers), the median, and the upper and lower quartiles, comprising the five-number statistical summary.

Question 6

Question 6Assertion. Line graph is a tool for comparison and is created by plotting a series of several points and connecting them with a straight line.Reason. You should never use a line chart when the chart is in a continuous data set.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

A is true but R is false.ExplanationA line graph is a tool for comparison, created by plotting a series of data points called 'markers' and connecting them with straight lines. This makes it easier to compare different data points and observe patterns. Line charts are suitable for continuous data sets, displaying information as a series of data and not restricted to discontinuous data sets.

Question 7

Question 1What is data visualization ?

Accepted Answer

Data visualization basically refers to the graphical or visual representation of information and data using visual elements like charts, graphs, maps and so forth.

Question 8

Question 2Name the Python library generally used for data visualization.

Accepted Answer

The Python library generally used for data visualization is Matplotlib library.

Question 9

Question 3Is Pyplot a Python library ? What is it ?

Accepted Answer

Yes, Pyplot is a Python library. Pyplot is a collection of methods within matplotlib library which allows user to construct 2D plots easily and interactively.

Question 10

Question 4Name the function you will use to create a horizontal bar chart.

Accepted Answer

The barh() function is used to create a horizontal bar chart.

Question 11

Question 5Which argument will you provide to change the following in a line chart ?(i) width of the line(ii) color of the line

Accepted Answer

(i) For changing the width of the line, we use the linewidth argument with the plot() function as: .plot(, [,data2], linewidth = )(ii) For changing the color of the line, we use the color argument with the plot() function as: .plot(, [,data2], )

Question 12

Question 6What is a marker ? How can you change the marker type and color in a plot ?

Accepted Answer

The data points being plotted on a graph/chart are called markers. To change the marker type and color, we use following additional optional arguments in plot function : marker = , markeredgecolor = .

Question 13

Question 7Using which function of Pyplot can you plot histograms ?

Accepted Answer

With Pyplot, a histogram is created using hist() function.

Question 14

Question 8Are bar charts and histograms the same ?

Accepted Answer

No, bar charts and histograms are not same. A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. On the other hand, a histogram is a type of graph that provides a visual interpretation of numerical data by indicating the number of data points that lie within a range of values.

Question 15

Question 9Name various types of histogram plots that you can create using Pyplot.

Accepted Answer

The types of histogram plots that we can create using Pyplot are cumulative histogram, step type histogram, stacked bar type histogram, horizontal histogram.

Question 16

Question 10What is a frequency polygon ?

Accepted Answer

A frequency polygon is a type of frequency distribution graph. In a frequency polygon, the number of observations is marked with a single point at the midpoint of an interval.

Question 17

Question 11What is the use of box plot ?

Accepted Answer

The box plot is used to show the range and the middle half of the ranked data.

Question 18

Question 12Using which function of Pyplot, can you create box plots ?

Accepted Answer

Pyplot module's boxplot() function allows to create box plots.

Question 19

Question 1A histogram is a plot that shows the underlying frequency distribution of a set of continuous data.

Accepted Answer

Please refer to the full solution above.

Question 20

Question 2Pyplot interface is a collection of methods within matplotlib library of Python.

Accepted Answer

Please refer to the full solution above.

Plotting with Pyplot

Assertions And Reasons

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