In a study by Valencia et al. (A-13), the effects of environmental temperature and humidity on 24-hour energy expenditure were measured using whole-body indirect calorimetry in eight normalweight young men who wore standardized light clothing and followed a controlled activity regimen.

Temperature effects were assessed by measurements at 20, 23, 26, and 30 degrees Celsius at ambient humidity and at 20 and 30 degrees Celsius with high humidity. What is the blocking variable? The treatment variable? How many blocks are there? How many treatments? Construct an ANOVA table in which you specify the sources of variability and the degrees of freedom for each. What are the experimental units? What extraneous variables can you think of whose effects would be included in the error term?