Correlation coefficient +1 means ?
Ans. is 'c' i.e., Very strong positive correlation A correlation simply expresses the strength and direction of the relationship between two variables in terms of a correlation coefficient, signified by 'C. Values of r varies from -1 to +1.; The strength of the relationship is indicated by the size of the coefficient , whereas its direction is indicated by the sign (+ or -) A plus sign (+) means : That there is a positive correlation between the two variables - high values of one variable (such as salt intake ) are associated with high value of the other variable ( such as blood pressure) i.e salt intake is directly propoional to blood pressure. A negative sign (-) means : That there is a negative correlation between the two variables - high values of one variables (such as cigarette consumption ) are associated with low values of the other ( such as life expectancy). Cigarette consumption is inversely propoional to life expectancy If there is a perfect linear relationship between the two variables so that it is possible to know the exact value of one variable from the knowledge of other variable, the correlation coefficient ( r) will be exactly + or - 1.00 ( +1 or -1 ). If there is absolutely no relationship between the two variables so that it is impossible to know anything about one variable on the basis of knowledge of the other variable. Then the coefficient will be 0.
Very weak positive correlation
Moderate positive correlation
Very strong positive correlation
Strong positive correlation