4# Problem set 1: Maize and malaria The pollen of the corn (maize) plant is known to be a source of food to larval mosquitoes of the species *Anopheles arabiensis*, the main vector of malaria in Ethiopia. The production of maize as increased substantially in certain areas of Ethiopia recently, and over the same time malaria has entered into new areas where it was previously rare. This raises the question, is the increase of maize cultivation partly responsible for the increase in malaria? One line of evidence is to look for a geographical association on a smaller spatial scale between maize production and malaria incidence. The data set "malaria-vs-maize. csv" contains information on several high-altitude villages in Ethiopia, with information about the level of cultivation of maize (low, medium, or high) and the rate of malaria per 10,000 people in each village.**EXERCISE 6: As mentioned above, the data set contains information on the level of cultivation of maize and the rate of malaria per 10,000 people in each village. What is the unit of replication in this dataset (e.g. , country, altitude region, village, or person), and how many independent replicates are there in total? (2 MARKS)**