reducing spine fractures. Fractures of the spine are common and serious among women with advanced osteoporosis ( low mineral density in the bones). Can taking strontium renelate help? A large medical experiment assigned 1649 women to take either strontium renelate or a placebo each day. All of the subjects had osteoporosis and had suffered at least one fractures. All were taking calcium supplements and receiving standard medical care. The response variables were measurements of bone density and counts of new fractures over three years. The subjects were treated at 10 medical centers in 10 different countries. Outilne a block desing for this experiment,with the medical centers as blocks. Explain why this is the proper design.

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