Hospitls must keep enough antibiotics on hand to treat infectious disease. Researchers want to determine whether the infectious disease rate is higher in some months than in others. To find out, researchers took a sample of 192 hospitals patients in January and found 32 were being treated for an infectious disease. In an indpndent Sample of 403 patients admitted in May, 34 were treated for an infectious disease. Give appoint estimate of the difference in the infectious disease admission rates in January and May,

a).079

b).093

c).086

d) .083