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There does not seem to be any strange behavior in our data for H2O2 given time in minutes such as influential data points in the scatter plot below. The plot is also grouped with c60 by different saturation of blue colour. Plots for all c60 levels show the positive relationship between H2O2 and time as the slops are all positive and a negative relationship between H2O2 and c60 as the mean lines are positioned from the top darkest to the bottom lightest. The subsequent statistical analysis will reveal whether the interaction between two covariates also have some impact on H2O2. All those data exploration techniques would not be necessarily because two predictors are controlled variables. As long as the response (H2O2) appear to be behaving well and it does, we should be able to feed the data into the statistical analysis as it is....
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