19. Mention the types of variable.
20. What kind of diagrams are more effective in presenting the following?
a) Monthly rainfall in a year
b) Composition of the population of Delhi by religion
21. What is mode? Give formula to find out mode in continuous series.
22. What is Wholesale Price Index? Write its drawbacks.
Answers
Answer:
answer 19) In scientific research there are four types of variable Independent variable, Dependent variable, Categorical variable and Continuous Variable.
answer 20) (i) The monthly rainfall in a year can be best ’ represented by a bar diagram as only one
variable i.e., monthly rainfall is to be presented diagrammatically. The rainfall is plotted on Y-axis in the corresponding month that is plotted on the X-axis.
(ii) Composition of the population of Delhi by religion can be represented by a component bar diagram. A component bar diagram shows the bar and its sub-division into two or more components. Thus, the total population can be sub-divided in terms of religion and presented through a component bar diagram.
iii) Different components of cost in a factory can most effectively be depicted through a pie chart. The circle represents the total cost and various components of cost are shown by different portions of the circle drawn according to percentage of total cost each component covers.
answer 21) The item which occurs most frequently in a data is called mode. To calculate mode