An article in Marine Biology [Allozymes an Morphometric Characters of Three Species of Mytilus in the Northern

An article in Marine Biology [€œAllozymes an Morphometric Characters of Three Species of Mytilus in the Northern and Southern Hemispheres€ (1991, Vol. 111)] discussed the ratio of the anterior adductor muscle scar length to shell length for shells from five different geographic locations. The following table is part of a much larger data set from their research.

(a) Are there differences in the mean ratios due to different locations at α = 0.05? Calculate the P-value.

(b) Analyze the residuals from the experiment. In particular, comment on the normality assumption.

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Location Ratio Tillamook, 0.057 0.081 0.083 0.097 0.081 0.086 Oregon Newport, Oregon Petersburg, 0.097 0.135 0.081 0.101 0.096 0.106 Alaska 0.087 0.066 0.067 0.081 0.074 0.065 Magadan, 0.103 0.091 0.078 0.068 0.067 0.070 Quebec Tvarminne, 0.070 0.102 0.095 0.097 0.103 0.105 Finland