Studies of workplace safety in construction and manufacturing firms have found that the rate of injuries tends to rise when the firms' work loads increase. Since inexperienced workers are often hired by these firms when work loads increase, the higher rate of injuries is undoubtedly due to a higher accident rate for inexperienced workers.
Which of the following statements, if true, would most weaken the conclusion drawn above?
(A) Many of the inexperienced workers hired when the firms' work loads
...
Which of the following statements, if true, would most weaken the conclusion drawn above?
(A) Many of the inexperienced workers hired when the firms' work loads
...








