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Petri Dish #1 Petri Dish #2 Petri Dish #3 n 20 20 20 sum(x) 673 668 841 sum(x 2 ) 17371 16728 25068 mean 33.65

Petri Dish #1 Petri Dish #2 Petri Dish #3
n 20 20 20
sum(x) 673 668 841
sum(x2) 17371 16728 25068
mean 33.65 33.40 42.05
Std Dev 3.60 3.49

Random samples of 20 c-elegans worms were collected from three Petri dishes exposed to different concentration of nutrients, to measure their length inmm. The distributions are normal and come for a SRS. We wish to know if these populations differ in total length (in mm) among these three types of nutrients. The data have been summarized to the right.

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