The method used by Henrietta Swan Leavitt in her discovery involving Cepheids, which is described in your textbook, is similar to:
A) The method of agreement.
B) The method of residues.
C) The method of difference.
D) The method of concomitant variation.
E) The joint method of agreement and difference.

Question

Quizplus · Accepted Answer

Henrietta Swan Leavitt's discovery involving Cepheids utilized the method of concomitant variation, where she observed a direct relationship between the luminosity of Cepheid variables and their pulsation periods. This means as one variable changes, so does the other, in a consistent manner.

The Method Used by Henrietta Swan Leavitt in Her Discovery