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QUESTION
In an experiment, Dr. Travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. In the experimental design, the amount of calcium is v
In an experiment, Dr. Travis examined the effects of calcium intake on osteoporosis, a condition that causes an increased risk of bone fractures. In the experimental design, the amount of calcium is
variable. The risk of bone fractures is
