In a study of a proposed approach for diabetes prevention, 339 people under the age of 20 who were thought to be at high risk of developing type I diabetes were assigned at random to one of two groups. One group received twice-daily injections of a low dose of insulin. The other group (the control) did not receive any insulin but was closely monitored. Summary data (from the article €œ Diabetes Theory Fails Test,€ USA Today, June 25, 2001) follow.

Do these data support the theory that the proportion who develop diabetes with the insulin treatment is significantly less than this proportion for the no- insulin treatment?

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Group Insulin Control Number Developing Dlabetes 25 24 169