The Perception of Danger Is an Important Characteristic for Survival

question 27

Essay

The perception of danger is an important characteristic for survival of animals. In a field experiment in Costa Rica, investigators located and directly approached black iguanas; that is, they walked straight towards them. Two treatments were randomly assigned to the individual iguanas. In one treatment the investigator gazed at the iguana while approaching, "maintaining eye contact." In a second treatment, the investigator did not gaze at the iguana while approaching. The outcome measure was the distance of the investigator from the iguana when it decided to run away. The researchers believe that eye contact is noticed by the iguana, leading to a longer approach distance. Data from this experiment appears in the table below. ​
a)Using a graphical display of your choosing, assess the assumption that the distributions of approach distances are approximately normal. State your conclusion in a few sentences.
b)Assuming that it is OK to proceed with a two-sample t procedure, determine if there is sufficient evidence to conclude that there is a shorter mean approach distance for the "Eye contact" group.
c)In a few sentences, state any concerns you have about your conclusions in part (b), based on your results from part (a). If you have no concerns, write "No concerns."

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Definitions:

Budgeted Units

An estimate of the quantity of goods or services that an organization plans to produce or sell in a specific period.

Planning Budget

A budget developed for various levels of activity, forecasting revenue and expense figures based on different production or sales volumes.

Net Operating Income

The profit a company generates from its regular business activities, excluding deductions for interest and taxes.

Units

A measurement or quantity of something considered as a standard measure, in business often referring to a single item of a product.