Whelks on the Pacific coast. Published reports of statistical analyses are oftenvery
Chapter 0, Problem 19.5(choose chapter or problem)
Whelks on the Pacific coast. Published reports of statistical analyses are oftenvery terse. A knowledge of basic statistics helps you decode what you read. In astudy of the presence of whelks along the Pacific coast, investigators put down aframe that covers 0.25 square meter and counted the whelks on the sea bottominside the frame. They did this at 7 locations in California and 6 locations inOregon. The report says that whelk densities were twice as high in Oregon as in California (mean SEM, 26.9 1.56 versus 11.9 2.68 whelks per 0.25 m2,Oregon versus California, respectively; Students t test, P< 0.001).3(a) SEM stands for the standard error of the mean, s/n. Fill in the values inthis summary table:Group Location n x s1 Oregon ? ? ?2 California ? ? ?(b) What degrees of freedom would you use in the conservative two-samplet procedures to compare Oregon and California?
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