A nutritionist believes that obesity is more prevalent among American adults than it was in past. He discovers that in the study conducted in the year 1994, 380 of 1630 randomly selected adults were classified as obese. But, in a more recent study, he finds out 726 out of 2350 randomly selected adults were classied as obese. At α=0.05, do these studies give evidence to support the nutritionist's claim that the proportion of obese adults has significantly increased since 1994?