10.89 Bees Insects hovering in flight expend enormous amounts of energy for their size and weight. The data shown here were taken from a much larger body of data collected by T. M. Casey and colleagues.21 They show the wing stroke frequencies (in hertz) for two different species of bees, n = 4 Euglossa mandibularis Friese and n = 6 Euglossa imperialis Cockerell.

a. Based on the observed ranges, do you think that a difference exists between the two population variances?

b. Use an appropriate test to determine whether a difference exists.

c. Explain why a Student's 7 test with a pooled estimator s is unsuitable for comparing the mean wing stroke frequencies for the two species of bees.

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E. mandibularis Friese E. imperialis Cockerell 235 180 225 169 190 180 188 185 178 182