The authors of the paper “Short-Term Health and Economic Benefits of Smoking Cessation: Low Birth Weight” (Pediatrics [ 1999]: 1312–1320) investigated the medical cost associated with babies born to mothers who smoke. The paper included estimates of mean medical cost for low-birth-weight babies for different ethnic groups. For a sample of 654 Hispanic low-birth-weight babies, the mean medical cost was $ 55,007 and the standard error (s/√n) was $ 3011. For a sample of 13 Native American low-birth-weight babies, the mean and standard error were $ 73,418 and $ 29,577, respectively. Explain why the two standard errors are so different.