A number of butterfly species mate for hours, and if a mating couple is disturbed, oneof the butterflies is responsible for flying, carrying its partner with it. Not only aremating pairs more noticeable to predators, the added weight may hamper the flightduring escape. Random samples of Green-veined White (Pieris napi) butterflieswere the subjects of a Swedish study to investigate the escape flights of singlebutterflies and of mating pairs when exposed to a predator. Data on the initial takeoffangle of escape are presented below. The investigators considered performing ahypothesis test to determine if there was evidence that the mean take off angle wasdifferent for singles and pairs. Using a graphical procedure of your choice,determine if the t-test is appropriate. 
Definitions:
Equivalent Units
A metric used in cost accounting to express the work done on partially finished goods as an equivalent number of fully completed units.
Partially Completed
Items or projects that have been started but are not yet finished to completion.
Automotive Parts
Components and systems that are used in the manufacturing and maintenance of vehicles, including cars, trucks, and motorcycles.
Costing System
A method used by businesses to estimate the cost of their products for profitability analysis, cost control, and inventory valuation.
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