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Quiz - correlations
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Terms in this set (10)
A tease arch study that looks for consistent relationship between 2 variables is called
A correlational study
A positive correlation means
High values of one variable are associated with high values or another variable
The number of storks nesting in some European villages is positively correlated with the number of human births in the villages. This means that
The number of human births may be predicted by knowing the number of storks nesting
Which of the following pairs best represents the positive correlation
School grades and IQ
A negative correlation means that
High values of one variable are associated with low values of the other variable
Which of the following pairs best represents a negative correlation
A out of exercise and occurrence of illness
2 sets of observations are compared: the first variable assesses a persons annual income and the other assessed the same persons number of dental problems needing care. Which of the following is the most likely outcome?
The 2 variables should be negatively correlated
Which of the following statements about the coefficient of correlation is true?
Correlations close to -1.0 or 1.0 are strong, whereas correlations close to 0 are weak
The strongest relationship as indicated by these correlation coefficients is?
.74 (bc it's closest to 1.0)
When 2 variables are not related the correlation coefficient will be close to
0
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