Instruction 4-1
Mothers Against Drunk Driving Is a Very Visible

question 25

Multiple Choice

Instruction 4-1
Mothers Against Drunk Driving is a very visible group whose main focus is to educate the public about the harm caused by drunk drivers.A study was recently done that emphasised the problem we all face with drinking and driving.Four hundred accidents that occurred on a Saturday night were analysed.Two items noted were the number of vehicles involved and whether alcohol played a role in the accident.The numbers are shown below:
$$\begin{array} { | c | c | c | c | c | } \hline & { \text { Number of Vehicles involved } } & \\\hline \text { Did alcohol play a role? } & \mathbf { 1 } & \mathbf { 2 } & \mathbf { 3 } & \text { Totals } \\\hline \text { Yes } & 50 & 100 & 20 & 170 \\\hline \text { No } & 25 & 175 & 30 & 230 \\\hline \text { Totals } & 75 & 275 & 50 & 400 \\\hline\end{array}$$
-Referring to Instruction 4-1,given that 3 vehicles were involved,what proportion of accidents involved alcohol?

• A)20/170 or 11.77%
• B)20/50 or 40%
• C)20/400 or 5%
• D)20/30 or 66.67%

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Definitions:

Genetic Drift

A mechanism of evolution that results in random changes in the frequency of alleles within a population over time.

Allele Frequencies

The proportion of different alleles of the same gene within a given population.

Cladistics

Making hypotheses about evolutionary relationships among clades.

Shared Characteristics

Traits or features that are common across a group of organisms, indicating a degree of genetic, structural, or functional similarity.