Osteoporosis, or a loss of bone minerals, is a common cause of broken bones in the elderly. A researcher on aging conjectures that bone mineral loss can be reduced by regular physical therapy or certain kinds of physical activity. A study is conducted on 200 elderly subjects of approximately the same age divided into control, physical therapy, and physical activity groups. After a suitable period of time, the nature of change in bone mineral content is observed.

Do these data indicate that the change in bone mineral varies for the different groups?
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Change in Bone Mineral Appreciable Little Appreciable Loss Change Increase Total Control Therapy Activity15 Total 15 32 30 60 70 70 38 16 25 75 48 200