In Evaluating the Following Generalization(s), Identify Sample, Population, Attribute of Interest

In evaluating the following generalization(s), identify sample, population, attribute of interest, and the extent to which the claims involved are knowable. Consider carefully the size and diversification of the sample and the extent to which the population differs or may differ from the sample; remember, what's important is that the sample be representative.
"In a study done by a University of Pennsylvania psychologist, 29 suburban and 38 inner-city children from the Philadelphia area, ranging in age from 3 to 12 years, were asked to consume foods mixed with 'disgusting' substances, like apple juice stirred with a used comb or containing a dead grasshopper. Almost two-thirds of the children from 3 to 6 sipped juice in which a grasshopper floated. There were no differences between city and suburban children." -Published in Developmental Psychology
Would it be safe to say, on the basis of this study, that the same percentage of all American children from ages three to six would be willing to sip juice in which a disgusting object floats? Explain.