Why is it hard for a woman to predict when she is pregnant?

predicting whether a test will be positive or negative is a difficult and useful prediction task, because it occurs in settings where the woman herself is sufficiently uncertain about whether she is pregnant that she believes taking a test is worthwhile.

Explanation:

it is not hard bc woman know when there pregant bc they would throw up in the moring and not have their period for awhile

Explanation:

b and d are your answers i just answered this question