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Medium 9781576336588

Introduction to Proofs: GRE Geometry

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Medium 9781576337363

Variables: CLEP Algebra I

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Medium 9781576336281

Algebraic Fractions: COOP-HSPT Algebra

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Medium 9781576336380

Addition: Fractions: GED Arithmetic

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Medium 9781576336922

Addition and Subtraction: Decimals: PSAT Arithmetic

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Medium 9781576336984

Percents: SSAT-ISEE Arithmetic

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Medium 9781576336397

Polynomials: GED Algebra

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Medium 9781576336274

Real Numbers: COOP-HSPT Arithmetic

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qtc12-1

N.P.Bali; P.N.Gupta; Dr C.P.Gandhi Laxmi Publications PDF

Unit-III

Correlation Analysis

12

Correlation and Regression

12.1. UNIVARIATE DISTRIBUTIONS

Distributions involving one variable are called univariate distributions. For example, marks obtained in a particular subject, wages earned by a group of workers.

12.2. BIVARIATE DISTRIBUTIONS

Distributions involving two variables are called bivariate distributions. For example, heights and weights of a certain group of persons, ages of husband and wife at the time of marriage.

12.3. CORRELATION

(P.T.U., M.B.A. Dec., 2009)

In a bivariate distribution, if the change in one variable affects a change in the other variable, the variables are said to be correlated.

12.4. POSITIVE OR NEGATIVE CORRELATION

(P.T.U., M.B.A. Dec. 2006)

If the increase (or decrease) in one results in a corresponding increase (or decrease) in the other, correlation is said to be direct or positive. For example, the correlation between income and expenditure is positive.

If the two variables deviate in opposite directions, i.e., if the increase (or decrease) in one results in a corresponding decrease (or increase) in the other, correlation is said to be inverse or negative. For example, the correlation between volume and pressure of a gas, correlation between price and demand, are negative correlation.

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Medium 9781576336380

Square Roots and Powers: GED Arithmetic

Ace Academics Ace Academics ePub
Medium 9781576336939

Polynomials: PSAT Algebra

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Medium 9781576336274

Percents: COOP-HSPT Arithmetic

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Medium 9781576336984

Square Roots and Powers: SSAT-ISEE Arithmetic

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Medium 9781576336830

Subtraction: Fractions: Praxis I Arithmetic

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Medium 9781576337387

Sequences and Series: CLEP Precalculus

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