Answer :
The correct option is option (d) . That's a zero order relationship means that there is no test factors have been controlled.
In statistics, there are many types of correlations that can be performed to determine the relationship between two variables. These types of correlations include Pearson's correlation, Spearman's correlation, point biserial correlation, and Kendall's correlation. You may also have come across the terms zero-order, partial, and partial in relation to correlation. These terms refer to correlations involving three or more variables.
A zero-order relationship means that the zero-order correlation simply refers to the correlation between his two variables (i.e. independent and dependent variables) and does not control for the possible influence of the other variable.
To learn more about Zero-Order Correlation, refer:
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