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2. Describing the relationship between two interval variables Malaria treatments using mefloquine were employed in 37 hospitals in Africa. The average treatment dosage (in mg/kg)

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2. Describing the relationship between two interval variables Malaria treatments using mefloquine were employed in 37 hospitals in Africa. The average treatment dosage (in mg/kg) and the percentage of malaria patients cured during a period of 1 month were recorded. Each hospital also specified the prevailing strain of malaria parasite in their patients-either Strain A or Strain B. A scatter diagram of the survival rate (the percentage of patients cured) and treatment dosage data follows. The least squares method is used to draw a straight line through the points. ? 100 90 80 ooo OO 0960 OO 70 o SURVIVAL RATE (Percent) O O O ooo 50 000 40 30 20 10 0 0 5 35 40 10 15 20 25 30 TREATMENT DOSAGE (mg/kg) There is relationship between survival rate and treatment dosage of mefloquine. The following gives the same scatter diagram, but with blue circles and orange squares to indicate Strain A and Strain B, respectively, for the prevailing strain of malaria parasite. ? 100 90 80 000 OO 70 0 60 50 SURVIVAL RATE (Percent) .. 40 30 20 10 0 0 5 35 40 10 15 20 25 30 TREATMENT DOSAGE (mg/kg) than when the prevailing strain of The survival rate when the prevailing strain of malaria parasite is Strain A (blue circles) is generally malaria parasite is Strain B (orange squares). The following is a scatter diagram of survival rate against treatment dosage for Strain A observations alone. 100 90 80 ooo OO 70 80 o SURVIVAL RATE (Percent) 40 30 20 10 0 0 5 35 40 10 15 20 25 30 TREATMENT DOSAGE (mg/kg) When the prevailing strain of malaria parasite is Strain A, there is relationship between survival rate and treatment dosage. The following is a scatter diagram of survival rate against treatment dosage for Strain B observations alone. 100 90 80 70 60 000 SURVIVAL RATE (Percent) 40 30 20 10 0 T 0 5 35 40 10 15 20 25 30 TREATMENT DOSAGE (mg/kg) When the prevailing strain of malaria parasite is Strain B, there is relationship between survival rate and treatment dosage

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