Green Sea Urchins. From the paper Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea
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Green Sea Urchins. From the paper “Effects of Chronic Nitrate Exposure on Gonad Growth in Green Sea Urchin Strongylocentrotus droebachiensis” (Aquaculture, Vol. 242, No. 1–4, pp. 357–363)
by S. Siikavuopio et al., the weights, x, of adult green sea urchins are normally distributed with mean 52.0 g and standard deviation 17.2 g.
For samples of 12 such weights, identify the distribution of each of the following variables.
a. x¯ − 52.0 17.2/
√
12
b. x¯ − 52.0 s/
√
12
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