Bees Insects hovering in flight expendenormous amounts of

Chapter 10, Problem 86

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Bees Insects hovering in flight expendenormous amounts of energy for their size andweight. The data shown here were taken from a muchlarger body of data collected by T.M. Casey and colleagues.15They show the wing stroke frequencies (inhertz) for two different species of bees, n1 4Euglossa mandibularis Friese and n2 6 Euglossaimperialis Cockerell.E. mandibularis Friese E. imperialis Cockerell235 180225 169190 180188 185178182a. Based on the observed ranges, do you think thata difference exists between the two populationvariances?b. Use an appropriate test to determine whether a differenceexists. c. Explain why a Students t-test with a pooled estimators2 is unsuitable for comparing the meanwing stroke frequencies for the two species ofbees.

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