Interpreting Graphed and Tabular Data 1. The use of DDT for malaria control stop
ID: 86395 • Letter: I
Question
Interpreting Graphed and Tabular Data 1. The use of DDT for malaria control stopped being funded by the World Health organization (WHO) in the 1980s. The World Bank required a ban on DDT for developing countries seeking loans. At the same time there has been an increase in the resistance of the malarial parasite to the most common antimalarial drugs. Since 2001, WHO has allowed the spraying of DDT in Africa on interior walls to kill mosquitoes. Review the graph in Figure 1.5 and information provided and then answer the following questions. What is the independent variable? What is the dependent variable? Why was a bar graph selected to present these data? Could the authors have used a line graph?Explanation / Answer
Dependent variable is the variable that is being tested in an experiment. Independent variable is the one which is changed or controlled in an experiment to test the effects on the dependent variable. Here, the independent variable is the number of malaria cases and dependent variable is DDT spraying.
Both bar graphs and line graphs can be used to compare changes over time. But, when trying to measure large changes over time, bar graphs are used and when smaller changes exists, line graph is used. Here, the change in number of malaria cases is very large after the year 1996 when compared to previous years. So, authors have used bar graph instead of line graph in this research.
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