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Do the data appear to require transformation before using a

1. Why can a transformation be useful when analysing data with parametric tests, especially ANOVA?

2. The following set of data is for the number of mosquito bites on the left arm of 16 volunteers in a trial of three specifically chosen insect repellents and an untreated control.

(a) Do the data appear to require transformation before using a single-factor ANOVA to compare the four treatments?

(b) What transformation would you recommend?

(d) Carry out the ANOVA. Is there a significant difference among treatments?

(e) Is a posteriori testing required? (f) Carry out an a posteriori test. Which repellent(s) would you recommend?

614_analysing data with parametric tests.png

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