Page 155 - Data Science class 10
P. 155
The below graph shows there are approximately an equal number of students who voted Classical and Rock as
their favourite music.
Favourite Type of Music
60
50
Number of Students 30
40
20
10
0
Classical Rap Bollywood Pop Rock
Student Choices
Students can explore favourite and second favourite music which are answers to questions 2 and 3 on the survey
through two-way graph as shown in following figure:
Rock
Pop
Second favourite type of music Bollywood
Other
Rap
Classical
Classical Rap Other Bollywood Pop Rock
First favourite and second favourite
choice of music
Here, they can say that all but two students have Pop and Rock as their first and/or second choices for type
of music preferences. In this graph, each dot represents a student in the class who responded to the survey. This
two-way graph shows 36 bins (6 possible second favourite music types by 6 possible favourite
music types). The bin in the top left corner has two dots in it, representing the two students
in the class who answered that their favourite type of music is Classical, and their second
favourite type of music is Rock. Analysis of the favourite and second favourite types of music
shows that nearly all the students (17 students, those shaded lighter in the above figure) in
the class have voted the Bollywood, Pop and Rock as their first or second choice. Only two
students (those shaded in a darker colour) did not rank Bollywood, Pop and Rock in top two.
Students can also look at the choice between live band and DJ and add this to their final
conclusions about the types of music that students like (as shown in the figure below). The
difference in the number of students, who prefer a live band versus a DJ, is zero.
Live DJ
Band
Distributions in Data Science 153

