Page 282 - Data Science class 11
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Example:

               V<-c(10,14,22,7,35,21,13,42,30,34,20)
               png(file= “histogram.png”)
               hist(V,xlab=”Weight”,col=”Red”,border= “yellow”)

               dev.off()
            2.  Explain Horizontal bar chart and Stacked bar chart.

          Ans.  A bar chart is a pictorial representation of data that presents categorical data with rectangular bars whose heights
              or lengths are proportional to the rules that they represent. R supports two ways to plot a bar plot. Vertical bars and
              Horizontal bars. The bar function attribute ‘horiz’ set to TRUE creates a Horizontal bar chart.

               Stacked bar chart extends the standard bar chart extends that standard bar chart from looking at numeric values across
              one categorical variable to two. Each bar in a standard bar chart is divided into a number of sub-bars stacked end to
              end, each one corresponding to a level of the second categorical variable. Stacked Bar Graphs are used to show how a
              larger category is divided into smaller categories and what the relationship of each part has on the total amount.



                                              Unsolved Exercise



             Objective Type Questions (Section A)


        A.  Tick ( ) the correct option.
            1.  Which plotting package simplifies the creation of complex plots from data in a data frame?

              a.  ggplot                                         b.  plotly
              c.  ggplot2                                        d.  pygal

            2.  The meaning of geom is:
              a.  Geometric                                      b.  Geographical

              c.  Geodesic                                       d.  Geotaxis
            3.  Some of the most commonly used R built-in data sets are:
              a.  Iris                                           b.  USArrests

              c.  ToothGrowth                                    d.  All of these

            4.  The attribute ‘main’ is used to:
              a.  Give the x axis title                          b.  Give the y axis title
              c.  Give the title of the pie chart                d.  Give the legends title

            5.  The value “o” in the type parameter of a line chart is used to draw:
              a.  Only the points                                b.  Only the line

              c.  Dotted lines                                   d.  Both points and lines
            6.  The data which is grouped into logical ranges in a histogram is known as:
              a.  Intervals                                      b.  Ranges

              c.  Groups                                         d.  Bins




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