poplar Tree Growth. An experiment is designed to evaluate the effectiveness of irrigation and fertilizers on poplar tree growth. Fertilizer is used with one group of poplar trees in a moist region, and irrigation is used with poplar trees in a dry region.

identify any problems that are likely to cause confounding and explain how the problems could be avoided. Discuss any other problems that might affect the results.

identify any problems that are likely to cause confounding and explain how the problems could be avoided. Discuss any other problems that might affect the results.