Lesson 2

Question 1

It measures the relationship between variables.

Answer 1

Correlation

Question 2

It predicts the outcome or effect of variable to another variable.

Answer 2

Regression

Question 3

It is a statistical tool to measure the association between variables.

Answer 3

Correlation

Question 4

It is concerned with the relationship in the changes and movements of two variables.

Answer 4

Correlation

Question 5

It measures the extend of relationship between variables.

Answer 5

Correlation

Question 6

What are the two types of correlation tests?

Answer 6

1. Pearson - Product Moment Correlation
2. Spearman Rho Correlation

Question 7

It is a type of data focused on descriptions or used to label variables without any order or quantitative value.

Answer 7

Nominal data

Question 8

It is a type of data where data can be put in order or when data have natural ordering.

Answer 8

Ordinal data

Question 9

These are data that contain the values that fall under integers or whole numbers.

Answer 9

Discrete

Question 10

These are data in the form of fractional numbers or decimals.

Answer 10

Continuous

Question 11

We can only use this correlation test strictly for discrete and continuous data.

Answer 11

Pearson-product moment correlation

Question 12

In this correlation test, nominal and ordinal data are accepted.

Answer 12

Spearman Rho Correlation

Question 13

It measures the nature and strength between two variables of the quantitative type.

Answer 13

Pearson’s Correlation / Product Moment Correlation Coefficient

Question 14

It measures the degree of linear association.

Answer 14

Pearson’s Correlation / Product Moment Correlation Coefficient

Question 15

It is denoted by r.

Answer 15

Pearson’s Correlation / Product Moment Correlation Coefficient

Question 16

What is the range of rho when using Pearson’s Correlation?

Answer 16

ranges from +1.0 (positive) to -1.0 (negative)

Question 17

What does the sign of r denotes in Pearson’s Correlation?

Answer 17

nature of association

Question 18

What does the value of r denotes in Pearson’s Correlation?

Answer 18

strength of association

Question 19

In this correlation, when x increases, y also increases.

Answer 19

Positive correlation

Question 20

It is correlation with direct variable.

Answer 20

Positive Correlation

Question 21

What value of r gives a perfect positive correlation?

Answer 21

1

Question 22

In this correlation, when the x increases, the y decreases.

Answer 22

Negative Correlation

Question 23

It is a correlation with indirect variable.

Answer 23

Negative Correlation

Question 24

What is the value of a perfect negative correlation?

Answer 24

-1

Question 25

In this correlation, there is an absence of any systematic tendency.

Answer 25

Zero Correlation

Question 26

Explain the arbitrary scale for the interpretation of r.

Answer 26

+-1.00 - Perfect Positive/Negative Correlation +-0.70 to +-0.99 - Strong/High Positive/Negative Correlation +-0.40 to +-0.69 - Moderate Positive/Negative Correlation +-0.01 to +-0.39 - Slight/Low Positive/Negative Correlation 0 - No Correlation

Question 27

It is a non-parametric measure of correlation.

Answer 27

Spearman Rank Correlation Coefficient

Question 28

How is Spearman Rank Correlation Coefficient denoted?

Answer 28

rsub(s)

Question 29

Spearman Rank Correlation Coefficient could be computed in the following cases.

Answer 29

1. Both variables are quantitative 2. Both variables are qualitative ordinal 3. One variable is quantitative and the other is qualitative ordinal

Question 30

It is a technique concerned with predicting some variables by knowing others.

Answer 30

Regression

Question 31

It tells you how values in y changes as a function of changes in values of x.

Answer 31

Regression

Question 32

It used for prediction.

Answer 32

Regression

Question 33

True or False. You can predict something even though variables have no correlation.

Answer 33

False

Question 34

What is line of best fit in linear regression?

Answer 34

y = mx + b