Minke Whales. Entanglement of marine mammals in fishing gear is a global issue and a significant threat to minke whales, in particular. In the article “Fishing Gears Involved in Entanglements of Minke Whales (Balaenoptera acutorostrata) in the East Sea of Korea” (Marine Mammal Science, Vol. 26, No. 2, pp. 282–295), K. Song et al. studied the body lengths of minke whales entangled near Korea. The following table provides summary statistics for the body lengths of minke whales entangled at different ocean depths.

Both variables, body length and ocean depth, are in meters.

Depth nj x¯j sj 0−49 39 4.49 0.80 50−99 20 5.06 0.79 100−149 28 5.75 1.20 150−199 14 5.99 0.97 At the 1% significance level, do the data provide sufficient evidence to conclude that a difference exists in mean body length among minke whales entangled at the four different depths? Note: For the degrees of freedom in this exercise:

α 0.10 0.05 0.025 0.01 0.005 Fα 2.14 2.70 3.25 3.99 4.55