The correct option is a. Linear association between two numeric variables.
This option is correct because simple linear regression is used to analyze
the linear association between two numeric variables by finding the best-fitting line that represents their relationship
Reason why other options are incorrect:-
b. Association between two categorical variables
This option is incorrect because simple linear regression deals with numeric variables, not categorical ones.
c. Differences of means between two numeric variables
This option is incorrect because it refers to the t-test for means comparison, not linear regression.
d. Variances between two numeric variables
This option is incorrect because simple linear regression does not investigate variances but focuses on the relationship between two numeric variables.
Hence,The correct option is a. Linear association between two numeric variables