Is there relationship between whether or not hiv transmitted

In each case, specify which of the two variables is the explanatory variable and which is the response variable. If it is ambiguous, explain why.

a. Is there a relationship between eye color and whether or not corrective lenses are needed by age 18?

b. For women who are HIV-positive when they get pregnant, is there a relationship between whether or not the HIV is transmitted to the infant and the length of time the woman had been infected before getting pregnant?

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