Correlation and Regression

Question 1

Types of correlation (Type 2 - 2 types)

Answer 1

Linear & Non-linear

Question 2

It is a nonparametric measure of the strength and direction of association that exists between two variables measured on at
least an ordinal scale.

Answer 2

Spearman rank-order correlation coefficient

Question 3

A correlation of +1 indicates a ______________ correlation.

Answer 3

perfect positive

Question 4

It deals with the estimation of one variable based on the changes or movements of the other variables. It helps solve problems concerning prediction, estimation and forecasting.

Answer 4

Regression Analysis

Question 5

The three methods of studying correlation

Answer 5

1. Scatter Diagram Method
2. Karl Pearson Coefficient Correlation of Method
3. Spearman’s Rank Correlation Method

Question 6

Interpretation for value of r between ± 0.20 to ± 0.39

Answer 6

Low correlation

Question 7

It is a type of correlation that involves two independent and one dependent variable.

Answer 7

Simple

Question 8

Types of correlation (Type 3 - 3 types)

Answer 8

Simple, multiple, partial

Question 9

It is a type of correlation that involves one dependent variable and more than one independent variable but only one independent variable is considered and other independent variables are considered constant.

Answer 9

Partial

Question 10

It is a method of statistical evaluation used to study the strength of a relationship between two, numerically measured, continuous variables (e.g. height and weight).

Answer 10

Correlation analysis

Question 11

Correlation lies between __ to __.

Answer 11

+1, -1

Question 12

Interpretation for value of r between ± 0.80 to ± 0.99

Answer 12

High correlation

Question 13

A ____________ indicates that there is no relationship between the variables.

Answer 13

zero correlation

Question 14

It is a type of correlation that involves one independent and more than one independent variables.

Answer 14

Multiple

Question 15

Interpretation for value of r between ± 0.01 to ± 0.19

Answer 15

Negligible correlation

Question 16

Types of correlation (Type 1 - 4 types)

Answer 16

Positive
Negative
No
Perfect

Question 17

Interpretation for value of r between ± 0.40 to ± 0.59

Answer 17

Moderate correlation

Question 18

It is the measure of the strength of the linear relationship between two variables that is defined in terms of the (sample) covariance of the variables divided by their (sample) standard deviations.

Answer 18

Coefficient of Correlation (r)

Question 19

Interpretation for value of r between ± 0.60 to ± 0.79

Answer 19

Moderately high correlation

Question 20

If X and Y are correlated variables and we want to predict or estimate the value of Y given the value of X, we have to find the _____________ that describes the relationship between the two variables.

Answer 20

regression equation

Question 21

A correlation of -1 indicates a _____________ correlation.

Answer 21

perfect negative

Question 22

To estimate if a relationship exists between two variables, this method is done by plotting the point corresponding to each observation on a rectangular coordinate system.

Answer 22

Scatter diagram