5.44 Fenthion: diagnostic plot. Fenthion is a pesticide used against the olive fruit fly in olive groves. It is toxic to humans, so it is important that there be no residue left on the fruit or in olive oil that will be consumed. One theory was that if there is residue of the pesticide left in the olive oil, it would dissipate over time. Chemists set out to test that theory by taking a random sample of small amounts of olive oil with fenthion residue and measuring the amount of fenthion in the oil at 3 different times over the year?day 0, day 281 and day 365.

a. Two variables given in the dataset Olives are fenthion and time. Which variable is the response variable and which variable is the explanatory variable? Explain.

b. Check the conditions necessary for conducting an ANOVA to analyze the amount of fenthion present in the samples.

c. Produce a diagnostic plot. What transformation is suggested?

data: https://www.dropbox.com/s/4jy15gpy3is5d8o/Olives.csv?dl=0

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