Having a look at Table 4, we can see that the total frequency of that clauses in which that functions as relative pronoun were 17. The mean pausing time preceding this pronoun in adjective clauses in read speech was 0.2730s and the following time was 0.0641s. The t-test result for both measurements, p=0.012, suggests a statistically significant difference. We quoted a few verbatim examples of adjective clauses from the
President‘s read speech text as in below: