Refer to Case Study 21.1 and the material in Part 1 of this book. a. In their

Question:

Refer to Case Study 21.1 and the material in Part 1 of this book.
a. In their original report, Thys-Jacobs and colleagues (1998) noted that the study was “double-blind.” Explain what that means in the context of this example.
b. Explain why it is possible to conclude that, based on this study, calcium actually causes a reduction in premenstrual symptoms.