Question #110396
Johnson (1966) measured bills of dusky flycatchers and found that bill lengths of the
males had a mean of 8.15 ± 0.021 mm (mean ± SE) and a coefficient of variation of
4.67 %. On the basis of this information, infer how many specimens must have been
used in the sample.
1
Expert's answer
2020-04-19T08:10:49-0400

Coefficient of Variation =sxˉ100=\frac{s} {\bar x} *100

4.67=s8.15100\frac {s} {8.15}*100

s=0.3806

SE=sn\frac {s} {\sqrt n}

0.021=0.3806n\frac {0.3806}{\sqrt n}

n=(0.38060.021)2(\frac {0.3806}{0.021})^2

The sample consists of n=329 speciments.



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