Consider a Study Testing Whether Birds Were Equally Likely to Rest

question 2

Multiple Choice

Consider a study testing whether birds were equally likely to rest on each streetlight. Researchers surveyed 30 randomly chosen streetlights in a city known to have many birds and counted the number of birds resting on each streetlight. Data on the number of birds seen on the lights are shown. (Note: No lights had more than three birds.) Assuming a Poisson process, what is the expected number of streetlights with three or more birds?
?
$\begin{array}{|cc|}\hline \begin{array}{l}\text { Number } \\\underline {\text { birds }}\end{array} & \begin{array}{l}\text { Number } \\\underline {\text { of lights }}\end{array} \\0 & 3 \\1 & 12 \\2 & 9 \\\geq 3 & 6 \\\hline\end{array}$

• A) 5.50
• B) 6.50
• C) 7.50
• D) 8.50

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Definitions:

Predict

To make an educated guess about the future based on data, trends, or patterns.

Female Life Expectancy

The average number of years a female is expected to live based on statistical averages.

Children Birth

The process or event of a child being born; often considered in statistical analyses regarding birth rates or outcomes.

Lurking Variable

A variable that is not included as an explanatory variable in the analysis but can affect the interpretation of relationships between variables.