The central tail feathers of the longtailed finch ( Poephila acuticauda ) are a sexually dimorphic trait hypothesized to play a role in sexual…

The central tail feathers of the longtailed finch (Poephila acuticauda) are a sexually dimorphic trait hypothesized to play a role in sexual selection. The longer tail feathers in males cost energy to produce, and this is thought to serve as a token of the male’s excellent health condition. Here are the lengths of the central tail feathers (average of the two central feathers, in millimeters) of 20 male and 21 female longtailed finches:

Males:

87, 77, 95, 73, 74, 85, 56, 86, 95, 108, 75, 87, 73.5, 82, 89, 64, 74.5, 87, 85, 86

Females:

60, 59, 72, 54, 65, 58, 59, 60, 65, 60, 68, 70.5, 80, 87, 65, 59, 65, 67, 62, 66, 70

We want to find, how much longer, on average, are the central tail feathers of male longtail finches compared to that of the females?

Fill in the blanks. Give your answers to one decimal place.

A 95% confidence interval for the difference in population mean length for the male and the female adult longtail finches is_Answer 1_to_Answer 2_.

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