Extensive data collected during the first half of this century showed clearly that in those years, American-born Japanese childern grew faster than did Japanese-born children. A research paper conjectured that improved economic and environmental conditions in postwar Japan had greatly narrowed this gap. To investigate the validity of this conjecture, a sample of Hawaiian-born Japanese children was obtained, and the children were categorized with respect to age. There were 28 11-year-old boys in the sample. The sample average height of these 28 boys was 133.15 cm, and the sample standard deviation of the height of Hawaiian-born Japanese children is 14.77 cm. Which is the 98% confidence interval for the average height of these 28 boys?