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 ...

Consider the hypothetical example in Fleiss (1981, pp. 6 -7) in which a test is applied to a sample of 1000 people known to have a disease and to another sample of 1000 people known not to have the ...

Output 62.4.2 displays tests of model effects and the estimated regression coefficients and their covariance matrix. Alternatively, you can assume that the linear relationship between corn yield ...

In this article, a new method for producing estimates from a multiple frame survey is presented. The discussion in this article is restricted to sample designs in which a stratified simple random ...