Producers of infant formula employ comprehensive food safety systems, including product testing to ensure those systems are working. A new study from the University of Illinois Urbana-Champaign finds ...

Stratified sampling is used to select a sample that is representative of different groups. If the groups are of different sizes, the number of items selected from each group will be proportional to ...

A total of 5,465 face-to-face household interviews were conducted using a stratified random sampling method, targeting citizens aged 15 and above. More than half of Nigerians would relocate abroad ...