Answer:
Step-by-step explanation:
The researcher cannot safely conclude that 90% of American mothers today do, in fact, breastfeed their infants for the first year of life because the sample size of 100 mothers-to-be used in the study is not representative of all American mothers. The sample size used in the study is too small and the mothers-to-be interviewed may have been self-selecting, meaning that they may not be representative of all American mothers. Additionally, the study was conducted at a single birthing center, and the results may not apply to mothers who give birth in other settings. Finally, the study was conducted at the 6-month checkup, which may not be representative of the population at large.