Which do you think is more valuable in expressing the relationship between calories and sugarlong dashthe covariance or the coefficient of correlation? Explain. A. The covariance is more valuable. It is not susceptible to the negative effects of lurking variables. B. The correlation is more valuable. It is the better measure for positive relationships. C. The correlation is more valuable. It can be used to determine the relative strength of a linear relationship. D. The covariance is more valuable. It is an exact measure of the strength of a linear relationship.

When you talk about finding a relationship between two quantitative variables such as calories and sugar, then the best that can be used in expressing this relationship is correlation. Correlational research is very useful because it helps in discovering the strength and directions that exist in a relationship between two variables. Although it does not say much about the cause and effect, it is used as a measure of linear relationship between two variables.

Covariance can mainly show the direction between two variables, but cannot be employed when trying to calculate the strength of the relationship between the variables. Correlation coefficient does a better job in measuring the strength of relationships between two quantitative variables.