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Suppose a new cancer drug is being tested on $200\text{ male volunteers}$ who have prostate cancer. The researchers decide to use a block design and wish to test the difference between the new drug and a more traditional treatment.

What would be an effective variable to block on?

A

Type of cancer.

B

Alphabetical by patients’ last names.

C

Advancement phase of the cancer.

D

Gender.

E

Geographical location of the patients.

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