NCERT Class 11 Statistics for Economics Chapter 7 Correlation Extra Questions and Answers
Class 11 Statistics for Economics Chapter 7 Extra Inside Questions and Answers – Correlation. Here in this Page Class XI Students can Learn Extra Questions & Answer 7th Chapter Statistics for Economics fully Inside.
We Provided Here Correlation Statistics for Economics Chapter 7 Long Answer Type Question, MCQ Questions & Answer, Short Answer Type Questions (2 or 3 marks), and Very Short answer Type Question (1 marks) Solution.
Class 11 Statistics for Economics Chapter 7 Inside based Question
Statistics for Economics Chapter 7 Correlation Class 11 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1.) What Does Correlation Measure?
Ans – Correlation studies and measures the direction and intensity of relationship among variables. Correlation measures co variation, not causation. Correlation should never beinterpreted as implying cause and effect relation. The presence of correlation between two variables X and Y simply means that when the value of one variable is found to change in one direction, the value of the other variable is found to change either in the same direction (i.e. positive change) or in the opposite direction (i.e. negative change), but in a definite way.
2.) Explain the types of correlation along with the examples.
Ans – Correlation is commonly classified into negative and positive correlation. The correlation is said to be positive when the variables move together in the same direction. When the income rises, consumption also rises. When income falls, consumption also falls. Sale of ice-cream and temperature move in the same direction. The correlation is negative when they move in opposite directions. When the price of apples falls its demand increases. When the prices rise its demand decreases.When you spend more time in studying, chances of your failing decline. When you spend less hours in your studies, chances of scoring low marks/grades increase. These are instances of negative correlation.The variables move in opposite direction.
3.) Explain the scatter diagram.
Ans – A scatter diagram is a useful ltechnique for visually examining the form of relationship, without calculating any numerical value. In this technique, the values of the two variables are plotted as points on a graph paper. From a scatter diagram,one can get a fairly good idea of the nature of relationship. In a scatter diagram the degree of closeness of the scatter points and their overall directionenable us to examine the relation-ship. If all the points lie on a line, the correlation is perfect and is said to be in unity. If the scatter points are widely dispersed around the line, the correlation is low. The correlation is said to be linear if the scatter points lienear a line or on a line.
4.) Give any four properties of correlation coefficient.
Ans – Following are the properties of the correlation coefficient.
I.) A negative value of r indicates an inverse relation. A change in one variable is associated with change in the other variable in the opposite direction.
ii.) If r is positive the two variables move in the same direction.
iii.) The value of the correlation coefficient lies between minus one and plus one, –1 ≤ r ≤1.
iv.) If r = 0 the two variables are uncorrelated. There is no linear relation between them. Howeverother types of relation may be there.
In case you are missed :- NCERT Extra Questions for Measures of Dispersion
5.) Explain the situations in which the calculation of rank correlation will be illustrated .
Ans – The calculation of rank correlation will be illustrated under three situations.
1.) The ranks are given.
2.) The ranks are not given. They have to be worked out from the data.
3.) Ranks are repeated.
1.) Correlation is commonly classified into
(a) Negative correlation
(b) Positive correlation
(c) Both (a) and (b)
(d) None of the above
Ans – option (c)
2.) The correlation is said tobe positive when the variables move together in the
(a) same direction.
(b) opposite direction
(c) Both (a) and (b)
(d) None of the above
Ans – option (a)
3.) Important tools used to study correlation are
(a) scatter diagrams
(b) Karl Pearson’s coefficient of correlation
(c) Spearman’s rank correlation
(d) All of the above
Ans – option (d)
4.) A ………….visually presents the nature of association without giving any specific numerical value.
(a) scatter diagrams
(b)Karl Pearson’s coefficient of correlation
(c) Spearman’s rank correlation
(d) All of the above
Ans – option (a)
5.) Karl Pearson’s Coefficient of Correlation also known as
(a)product moment correlation coefficient
(b) simple correlation coefficient
(c) Both (a) and (b)
(d) None of the above
Ans – option (c)
6.) It gives a precise numerical value of the degree of linear relationship between two variables X and Y.
(a)product moment correlation coefficient
(b) simple correlation coefficient
(c) Karl Pearson’s Coefficient of Correlation
(d) All of the above
Ans – option (d)
In case you are missed :- NCERT Extra Questions for Use of Statistical Tools