14.47 Antibiotics and Infection Infections some- times occur when blood transfusions are given during surgical operations. An experiment was conducted to determine whether the injection of antibodies reduced the probability of infection. An examination of the records of 138 patients produced the data shown in the table. Do the data provide sufficient evidence to indi- cate that injections of antibodies affect the likelihood of transfusional infections? Test by using a = 0.05.

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Infection No Infection Antibody No antibody 4 78 11 45