1. correlational coefficients are commonly used measures one encounters in behav
ID: 407560 • Letter: 1
Question
1. correlational coefficients are commonly used measures one encounters in behavioral science research papers and scholarly publications. Correlation coefficients...
a. can range from a minimum negative value of -100.0 to a maximum positive value of 100.0
b. are not appropriate statistical measures if the sample size for a study exceeds 25 cases
c. need cautious analysis since r2 can differ widely between samples and populations
d. are most appropriate when nominal scales are used as the unit of measure
e. None of the above
Explanation / Answer
Correlation is a measure of association between two variables. The variables are not designated as dependent or independent. The two most popular correlation coefficients are: Spearman's correlation coefficient rho and Pearson's product-moment correlation coefficient.
When calculating a correlation coefficient for ordinal data, select Spearman's technique. For interval or ratio-type data, use Pearson's technique.
The value of a correlation coefficient can vary from minus one to plus one. A minus one indicates a perfect negative correlation, while a plus one indicates a perfect positive correlation. A correlation of zero means there is no relationship between the two variables. When there is a negative correlation between two variables, as the value of one variable increases, the value of the other variable decreases, and vise versa. In other words, for a negative correlation, the variables work opposite each other. When there is a positive correlation between two variables, as the value of one variable increases, the value of the other variable also increases. The variables move together.
The standard error of a correlation coefficient is used to determine the confidence intervals around a true correlation of zero. If your correlation coefficient falls outside of this range, then it is significantly different than zero. The standard error can be calculated for interval or ratio-type data (i.e., only for Pearson's product-moment correlation).
Answer for this question:
correlational coefficients are commonly used measures one encounters in behavioral science research papers and scholarly publications. Correlation coefficients...
c,) need cautious analysis since r2 can differ widely between samples and populations
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